Pre-courses are a waste of money (mostly). If you’ve never taken a statistics course EVER, then the stats pre-course is probably worth it. The Accounting pre-course is covered again in the first two weeks of class. The content of the finance pre-course don’t really become useful until Q3, by which point you’ve already forgotten everything.
The two reasons I can think of for actually taking pre-courses is to get you back into the learning mindset and to make Accounting easy for the first 2 weeks and thus reducing your course load for a bit.