No personal experience, but from what I’ve read, it really depends on your student. If math is a strong subject, then I don’t think it’s necessary. They can use the practice tests and brush up on their own for the MPE. If they’ve already taken the MPE and did well, again, I don’t think it’s necessary.
If your student is borderline or barely passed the MPE, then I would enroll to prepare for Math 151.
Personalized Precalculus Program (PPP) link:
https://ppp.tamu.edu/