Other people have posted that you don't need to worry, but I just thought I'd reiterate that. A 24 is a very high score for the first TPR Diagnostic Test. It is a very hard test and TPR does that for several reasons. First, they want to freak you out so that you stay in the class (if you scored a 35, you'd quit and ask for a refund!). Second, they want to motivate you to study. Finally, they want to be able to claim at the end of the course that you've increased your score dramatically by taking their course. That way you aren't eligible for a refund and it makes them look great. Everyone improves, usually significantly, from their first diagnostic score. You haven't gotten into the full groove of studying yet and you haven't hit all the material yet. As you continue to study, your scores will skyrocket. The first three TPR diagnostics are very tough and aren't a good approximation of the real test. After those three, you will be given the actual AAMC tests which are a far better approximation of how you will do. Everyone jumps from Diag 3 to Diag 4, not only because they've been studying, but because the tests are far more realistic! The bottom line is that TPR is a business and they want to keep the money coming in, so guaranteeing improvement from your first diagnostic score is a whole lot easier when the test is very hard! That being said, TPR is still in business for a reason. Their test-prep strategies (including how they set up their diagnostic testing schedule) have worked for many, many people. So, don't stress about the score...you are in very good shape...but keep up the studying and use their methods to motivate you so that you do very well come April. Good luck!