I had an about 1100 SAT and a 2.9 HS GPA and I graduated.
I have a knack for physics which was a huuuuuge help as an engineer. The hardest classes for me plebe year were calculus, I admit to getting a bit lucky with which professors I had which enable me to survive. Honestly, my academic struggles were directly related to the level of effort I put in or didn't put in is more accurate. I was not a studious person and barely cracked a book to the detriment of my GPA. Like beyond, I saw plenty of 1600SAT, 4.0 students not last past Christmas.
My advice to anyone is make plebe year all about your GPA. Minimize/eliminate extracurriculars and don't overdo the regiment. No one is going to get kicked out for a sloppy uniform or ugly shoes. Go low-profile and crank out a high GPA plebe year, it can save you down the road if your struggling when the regiment and time management get easier but the classes get harder.