I just finished this course about a month ago. Yes, the material is important and interesting but ultimately it is NOT whats most important. Please heed my advice and start taking practice tests within the first 2-3 weeks. I pushed them all and am finding that i'm really struggling although I know all the content. The actual content you have to know for the MCAT is not challenging (assuming you've been through a pre-med curriculum), however, learning what and how the MCAT likes to ask question is a HUGE learning curve.
Also, I wish someone had told me this before starting TPR, so I'm telling you this now. TPR's practice tests are incredibly difficult compared to all other available materials and they severely deflate your scores. Do NOT let this get you down, push through them. I feel like I really hit a wall when I was trying to take these tests cause they were just awful time after time. Try your hand at all the actual AAMC material after a couple rounds of being knocked down by the TPR exams, it's REALLY not actually as hard as they make it sound.