The STOR Summer Boot Camp is a great way to brush up on your real analysis and linear algebra knowledge before starting the first-year courses in the fall. You can find more information on this year’s boot camp here.
The boot camps is not mandatory, but many students find it helpful. You can try to show up the first couple of days, and if it doesn’t seem useful, you can stop. If you don’t think you’d benefit from showing up to the sessions, then you may be better served working through the material on your own before classes start. Either way, it’s recommended that you familiarize yourself with the material and get into a groove with your study habits before classes start.
For information about topics that are not covered in the bootcamp but may be useful in the graduate program, see here.