Tbh it's probs best to just make sure you're surrounded by friends who will be on you about it. While I did have a friend that was studying for the MCAT at the same time as me, I also had several other friends (one of whom had already been admitted to school) who just also checked in on whether I was still on top of everything.
Overall, you don't necessarily need someone else whose prepping to be keeping you accountable (let alone a relative stranger).