I took the MCAT September 2020. I graduated almost 5 years ago now, so it had been a while since I had taken the prereq's. I also worked full-time while studying, so I had to optimize my time. Each person is different, and whether the described timeline/plan is enough for you is hard to say. You'll want to take a diagnostic to see where you're starting and monitor your progress with full length exams. I studied about 4 hours a day, 6-7 days a week. I started with about 6 weeks of content review with the Kaplan books and then did 5 weeks of practice questions and full length exams. I utilized UWorld for practice and liked it (they have good explanations), but the AAMC material should always be top priority since it's most representative. I cannot emphasize enough the importance of practice. This test is a beast, but you don't need to know everything to beat it. Practice and get used to the questions and types of answers they're looking for. This helped me a lot. I ended up getting a 510+ on the exam following the schedule I just mentioned. So, is it possible to get your ideal score in the 15 weeks you mentioned using the resources you listed? Absolutely, it's possible. You just have to make it happen. Good luck!