Will I be able to sit for school after my BBL?

This is really dependent on your surgeon’s postoperative protocol. Iprefer my patients not sit for about 2 weeks after surgery and then afterwardsthey sit on a donut for about a month just to offload the pressure on thebuttocks.Any pressure that you put onthe buttocks can compromise the viability of the fat cells.Placing pressure on the fat cells can causethe cells to die and make your buttocks smaller.It is best to follow-up with your PlasticSurgeon for more specific questions.

You should be able to sit within a few weeks, but with some support devices. This is an important element of your post surgical care that you need to discuss with your physician. 

Hello dear!!
Thanks for the question and provided information as well.
I recommend my patients to allow 2-4 weeks for recovery, and to wait at least 7-10 days before going back to work, but each doctor has their own protocol.
I also recommend not to sit for more than 30 mins. every two hours, for the first 2 weeks, and always with the help of a boppy pillow. Remember that each doctor has their own protocol, it is very important that you talk to him and follow his instructions.
Hope this is helpful. Good luck :)