I haven't taken the MCAT yet but have done two of TBR tests. I also took the Next Step 1/2 length diagnostic as well as a Kaplan full length. The second TBR test has no psychology/sociology section- it is basically another CARS section but with topics focused on mental health/sociology issues - I ended up just skipping it. I felt their science sections were good, though difficult. I felt there were too many subjective answers on the CARS sections as well, nuance of words and too many equally valid answer choices. Just my opinion though. The Kaplan was by far more difficult in the content of the CARS and the sciences - again, just my opinion. I plan to do an EK exam in a day or so.