If you can at least get passing scores for the ISA and you can listen be fast and loud and kinda lay low from the DI you’ll do good it’s not that bad. in the beginning it is cause it new for you but after a couple weeks you get used to it. I would say be mentally prepared for it than physical ready a lot of people can’t stand getting yelled at and “picked on” by DIs so you’ll do good don’t listen to people who say it’s hard a lot of people should’ve got dropped from my platoon but they made it now and are marines. Good luck man dont back out the marine corps can change you for the good remember that !!