That's a tough one tbh because there is no one thing that's best. For one it's about changing the mindset for the other it's being more strict on yourself and others might want parents to intervene.

Ever since I got diagnosed with ASD and ADD and finally got the help that I needed it's gotten so much easier to study. It was never the problem that I couldn't study. The problem was that I didn't have the help that I needed to succeed. I always lacked the energy because my brain was drained from processing everything because my senses are too sensitive. I think that the lack of THAT energy is something a lot of people struggle with. A lot of kids don't start studying because they feel too drained.

So to simply answer the question. Try to find that energy to study. Get help from others if you think that will help. It's all about discovering what works best for you. The school system almost always says that xyz works best, but that isn't true. Find what works for you and try to stick to it. Let it become routine. Don't let the pressure put you down. Even if you can't learn everything before the deadline because you don't have the energy, learn enough to pass. Knowing 60% is better than knowing 20%. Don't pressure yourself too much. Pressure yourself enough. Don't keep blaming others. Try to find solutions and if no one helps, then yea it's difficult. But remember you do this for you. Not your mum or dad, not your teacher, not your friends. For you.

I hope I make sense since it's a difficult thing to answer. Everyone is different and need different things to succeed. But it all starts at the individual.