I have a few general tips.
You are going to be spending every waking moment with the people on your course. Learn to work with these people even if you don't like them or if you disagree with them. Don't be surprised if most people follow the "me first" rule for the first half of the course, since that's how most people think, and the teamwork thing hasn't set in yet. Your course staff will drill this into your heard right from the beginning, and it's true. Learn to work together and the insane and seemingly impossible time limits imposed on you will actually be quite possible.
Shaving first thing in the morning is more than a lifehack here, it's necessary as you will rarely ever go back to your floor during the day before classes are over. On days where you have PT at 0510, don't shave until after PT because it's almost impossible unless you wake up early. Don't be one of those fuckers that wakes people up before 0500 because you "need extra time to get ready". Learn to be as quick as everyone else.
Some people take longer to adjust to the pace set by the military. I was one myself, and some people on my platoon hated me for taking a week or two longer to settle into the groove. Don't beat yourself up if you are like this as well, as it will come eventually, and life at basic will seem completely normal.
Never argue with instructors for any reason. If you do something stupid, the reply you give to staff is "no excuse, [rank]", or "It won't happen again, [rank]". If you say this enough, they will probably stop giving you any problems.
If you remember to bring everything that is required for the day, don't argue with staff, and try your best, you're almost guaranteed to pass the course and not have to redo it. Myself, I had a hard time with inspections. I could run ten times faster and longer than 90% of people on my course, and I always got 100% or close to it on all tests, but I fucking sucked at making sure my clothes were folded to exactly 30cmx30cm, and I still can't shine my boots for shit, which made my inspection scores suffer. Don't be afraid to ask for help if you need it. It might seem like a weakness right when you first join, but people who have been in for several years know that asking for help is not at all a sign of weakness. Many trades have so many small detains associated to them that a lot of people don't actually see some of them in their careers, and have to ask others for help. In my own trade, it is not at all uncommon for someone who is two or three ranks above me to not know a thing about what I am doing, and they ask for help. I see it as fine since my trade is so varied depending on where you are posted. If you are really good at something, tell someone you will do that for them if they do something they are good at for you. I ended up being somewhat of a personal trainer for someone on my course in exchange for them ironing all my shirts because they were good at that.