I’m going to tell you about two different study styles and why one is not necessarily better than the other.
I am a perfectionist and I worked way too hard on my homework to get good grades when in fact, as long as I graduated, it didn’t really matter. Unless you are trying to get in to a top college in which case you may need to go to a two year college and then move up after you have sorted some things out. No employer has ever asked me what my GPA was.
My son is MUCH smarter than I am…as the person above stated, he has the hardware and the software. He went through a 5 year university program in 4 years with a double major in Biochemistry and Math, was the captain of a rugby team that made it to the national finals, partied with his friends frequently, drove two hours each way to come home to hang out with his old childhood friends on many weekends. His philosophy is and was “C’s get degrees”. He is now a 3rd year medical school student and his philosophy has not changed. As long as he passes, test taking does not necessarily make a good doctor. Once he decides his specialty THEN he must learn the ins and outs but medical school is about learning EVERYTHING about the body. No one doctor needs to know all of it. My point is that if you just keep going and finish knowing you did your best, that is ok. And make time for a social life! It is important to rejuvenate your mind!
I know you are still in high school and it is a bit different but remember, it might not be ideal but C’s get degrees.
Oh, and consider a tutor, mentor or a study group where you can see different learning methods from your peers. You sound very dedicated and I am sure things will work out for you in the long run!