Free MCAT Diagnostic Test: Start Your MCAT Journey Here

Person smiling while taking test on laptop representing MCAT diagnostic test - image by Magoosh

When you’re starting your MCAT prep, the very best place to begin is with an MCAT diagnostic test! Not only will this help familiarize you with MCAT question type variations, but it’ll also give you a sense of the content the exam tests, as well as its difficulty level.

Beyond that, an MCAT diagnostic test is a great way to start your MCAT preparations because it shows you what currently stands between you and your goal score. Don’t get me wrong—there’s a lot of room for growth between MCAT scores on a diagnostic and what you can achieve on test day! But getting a sense of your strengths and weaknesses on a practice exam can help you maximize the former and minimize the latter!

Ready to dive in? Here’s Magoosh’s free MCAT diagnostic test—featuring MCAT practice questions designed by our experts to show you what subject area (or areas) might need your attention before the real exam!

Free MCAT Diagnostic Test

Checklist with first aid symbol representing end of MCAT diagnostic - image by magoosh
Welcome to the Magoosh MCAT Diagnostic! These questions were created by our MCAT experts to test your knowledge of the MCAT subjects (except CARS questions, which will test your knowledge of how the section works). We recommend taking this quiz before you start your prep!


1. During an experiment, a large, polarized compound is seen entering a cell and moving down its concentration gradient, without energy input. What mechanism of transport is most likely occurring?


2. Which of the following DNA sequences would have the highest melting temperature?


3. Which type of bond links nucleotides to form a single stranded chain?


4. During pregnancy, Hemoglobin F (HbF) has a lower P50 value and a higher affinity for oxygen that Hemoglobin A (HbA). How will the oxygen dissociation curve for HbF compare to the curve for HbA?


5. During the citric acid cycle, isocitrate dehydrogenase (IDH) catalyzes the conversion of isocitrate to α-ketoglutarate. Which class of enzyme is IDH?


6. A novel drug inhibits the conversion of ATP to cAMP by adenylate cyclase, disrupting the second messenger system within a cell. This drug most likely causes:

Organic Chemistry

7. The substrate shown below undergoes two subsequent hydrolysis reactions. What is the product?

Hydrolysis reactions

Organic Chemistry

8. What is the name of the molecule shown below?


Organic Chemistry

9. Which of the following compounds can undergo a keto-enol tautomerization?



10. All of the following are underlying assumptions/conclusions of the ideal gas law EXCEPT:


11. Which of the following molecules has bond(s) of the highest order?


12. Combustion reactions are used by the body to burn food and yield energy. When is the combustion reaction of sucrose C12H22O11 (s) + 12O2 (g) → 12CO2 (g) + 11H2O(g) + ΔH spontaneous?


13. A roller coaster cart situated at rest 50 m above the ground falls along the track into a circular loop of radius 10 m on the ground. What is the velocity of the cart at the top of the loop assuming no friction is involved?


14. A newly developed vaccine requires the administration of 3 mL of vaccine. How much pressure must be applied to administer the vaccine with a 10 mm diameter syringe if a nurse uses a force of 30 N to deliver the vaccine? (1 L·atm ≅ 100 J)


15. An electron is perpendicularly shot into a 5 T magnetic field at a velocity of 10 m/s. What is the radius of the circle created by its motion in the field? (charge of an electron = 1.6×10–19C; mass of an electron = 9.1x10–31kg)


16. A student consistently receives poor grades on a math exam. If the student takes the behaviorist perspective, they will attribute their poor performance to:


17. A child is presented with a box of multi-colored blocks. They are able to sort the blocks by color and by size. Which of the following tasks would the same child be least likely to perform?


18. A woman tells a friend that her mother taught her how to ride horses at age 8. Later that day, the woman flips through an old photo album and realizes that it was actually her father, not mother, who taught her to ride. This is an example of:


19. Which of the following is NOT part of the “sick role?”


20. The term used to describe the number of children a woman is most likely to have in the course of her lifetime is:


21. Complete the sentence below with the statement that best describes social capital.

A new graduate is chosen for a job because:

Critical Analysis and Reasoning Skills

22. Some CARS passages have more questions to answer than others. What is the greatest number of questions you will see attached to a single passage?

Critical Analysis and Reasoning Skills

23. Which of the following would not appear as the main topic for a CARS passage?

Critical Analysis and Reasoning Skills

24. Which of the following Critical Analysis and Reasoning Skills (CARS) question types most frequently appears on the MCAT?


Should I take an MCAT diagnostic test?

The general answer to this question is: yes, you should take an MCAT diagnostic exam—with some caveats. An MCAT diagnostic test requires a good amount of time and sometimes money as well (though Magoosh has you covered with the free MCAT diagnostic!).

If you’re ready for more practice, sign up to get a FREE full-length MCAT practice test designed by Magoosh MCAT experts. Click the image below to get started!

Click link to access free Magoosh practice test

Besides the free Magoosh MCAT test, I would highly recommend the one put out by the AAMC itself. This full-length practice exam is the gold standard of MCAT practice exams. It costs $35 and provides a simulated score. This is an “official” MCAT diagnostic test and, in my opinion, provides the best indication of what your score range will be.

Note that you can also get a full-length, free MCAT practice test in your official AAMC account, under “MCAT Official Prep Hub.” However, only the previously mentioned AAMC sample test provides you with scaled scoring information.


When to Take an MCAT Diagnostic Test

MCAT diagnostic tests can provide a lot of information. However, unlike full-length MCAT practice tests that you use in MCAT prep, diagnostics are not study tools per se. Instead, they let you know areas of strength and weakness, as well as an estimated score for the real exam. They do not teach you much about how to improve your areas of weakness, and this really requires time and effort on the test-taker’s part.

My advice on how to use an MCAT diagnostic test is to use one at the very beginning of your study time and another at the very end.

Analyzing Your Results and Next Steps

You’ve taken your first MCAT diagnostic test, you’ve gotten your scores—now what?

  1. Review your answers—both the right answers and wrong answers. Take a look at any patterns that you see, then write them down. Acing biochemistry questions? Struggling with psychology and sociology? Circle any areas that you know you want to work on.
  2. Next, create a schedule using the information you’ve learned from your MCAT diagnostic test. This can be as simple as noting that on Wednesdays, you study organic chemistry (and wear pink). Or (better option!) you might choose to use one of Magoosh’s MCAT study schedules to cover the content areas you need in an organized, efficient way before test day.
  3. Then, it’s time to identify the best resources to help you achieve your goals. This can involve anything from taking an online course to working with a tutor, or some combination of methods. And, depending on when you took MCAT-related courses, you can focus on materials for one section, like Chemical and Physical Foundations of Biological Systems, or every section. We definitely recommend at least reviewing the materials you’ll see on all parts of the test. You don’t have to retake General Chemistry if it’s fresh in your mind, but looking at how the MCAT tests this will be important.

From MCAT Diagnostic Test to Full-Length Practice Tests

An MCAT diagnostic test can help lay the groundwork for your prep, but before your actual exam, it’s key to take at least one practice MCAT exam. The earlier you can start doing this, the better.

Trust me: I know it’s really easy to say, “My test isn’t until September; I’ll brush up on my bio and do it later.” But even once you’ve studied everything you need to know about the biochemical foundations of living systems (not to mention the biological foundations of behavior!), you still won’t build the endurance you need for test day until you sit down and put it to the (7.5-hour) test.

You can also check out this list of free MCAT practice tests! The AAMC store also offers the opportunity to bundle full-length exam purchases, as well. If you’re prepping for more than a week or two, we highly recommend getting more than one of these full-length practice tests; the savings can be big. Some bundles include the official guide and question packs that serve as section banks, as well.

As you get closer to your test date, your practice test scores will let you know if you are reaching your target score range. If you are way off from where you want to be, this can perhaps be helpful in a decision to postpone your test date.

  • If test day is quickly approaching and you don’t have time for full-length practice tests, the AAMC question packs are a great resource to work on individual sections you’ve flagged in your diagnostic test. Topics include biology, chemistry, physics, a CARS diagnostic, Critical Analysis and Reasoning Skills, and question banks containing mixtures of MCAT sample questions.

Takeaways After Completing Your MCAT Diagnostic Test

Congratulations! By taking this MCAT diagnostic test, you’ve also taken the first step on the road to becoming a physician. While the topics (not to mention the length) of the MCAT can be overwhelming, remember: everything you’re studying today will help your future med student self!

Good luck!

Get a free MCAT practice test!


  • Rachel Kapelke-Dale

    Rachel is one of Magoosh’s Content Creators. She writes and updates content on our High School and GRE Blogs to ensure students are equipped with the best information during their test prep journey. As a test-prep instructor for more than five years in there different countries, Rachel has helped students around the world prepare for various standardized tests, including the SAT, ACT, TOEFL, GRE, and GMAT, and she is one of the authors of our Magoosh ACT Prep Book. Rachel has a Bachelor of Arts in Comparative Literature from Brown University, an MA in Cinematography from the Université de Paris VII, and a Ph.D. in Film Studies from University College London. For over a decade, Rachel has honed her craft as a fiction and memoir writer and public speaker. Her novel, THE BALLERINAS, is forthcoming in December 2021 from St. Martin's Press, while her memoir, GRADUATES IN WONDERLAND, co-written with Jessica Pan, was published in 2014 by Penguin Random House. Her work has appeared in over a dozen online and print publications, including Vanity Fair Hollywood. When she isn't strategically stringing words together at Magoosh, you can find Rachel riding horses or with her nose in a book. Join her on Twitter, Instagram, or Facebook!

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