Not necessarily!

… but 1-2 practice tests is unlikely to be as helpful as 11-12, and some students may benefit from more depending on learning style and target MCAT score.

Although there are some students who believe that 'more MCAT practice is better', perhaps a more realistic expression would be: 'more effective MCAT practice is better'. There is little value to have extra full-length MCAT practice tests if you don't have the time and motivation to use them as full-length practice which includes a careful review of answers and explanations over 1-2 days per exam. Frankly, re-taking mock exams is not an efficient use of time for most students. However, taking brief, effective notes from your MCAT practice test experience and reviewing all of those notes several times per week builds knowledge, reasoning and confidence moving forward. Choose the number of practice exams according to your needs, budget and schedule.

It's also important to note that no one company provides the perfect practice test experience. Of course, the AAMC - being the official MCAT organization - is best but other than that, there are as many opinions as learning styles. Most students with high, official MCAT scores have used a variety of reputable MCAT practice tests.