i found the kaplan course very helpful. i had taken most of the pre-reqs a few years before, but the physics 6 or7 years before. the nice thing about the kaplan course is that they cover only the material you need to know for the exam. it’s condensed, so you might have to study up on something once you realize you have forgotten it, but the course provides a good road map for studying. the course also focuses on test taking strategies, which i found helpful.
overall, i think the kaplan course is much more focused prep than retaking the full prereq courses. even if you took the courses years ago, i’m sure the information will come back to you pretty quickly. good luck!