How do I put in 100% effort?

I really really want to do well in my exams this year. I do well enough (basically average) , but usually I feel like I’ve gotten somewhat lucky, because i had seen the question in the past or right before the exam my friend told me some random info. I want to do well for real for once, not relying on my friends, I want my parents to actually think I’ve achieved something on my own. I have exams (real ones not mocks) next year, and I want to put in 100% effort, but I’ve literally never done that. I’m definitely lazy, I definitely procrastinate, and I’ve just never actually tried really really hard to do well in exams. I’ve revised, but I don’t think I put in real effort ever, because I would mostly just rewrite stuff and listen to music. I’m not smart or gifted, but I want to really put in effort for once. I only have a year, How do I do this?

I really really want to do well in my exams this year. I do well enough (basically average) , but usually I feel like I’ve gotten somewhat lucky, because i had seen the question in the past or right before the exam my friend told me some random info. I want to do well for real for once, not relying on my friends, I want my parents to actually think I’ve achieved something on my own. I have exams (real ones not mocks) next year, and I want to put in 100% effort, but I’ve literally never done that. I’m definitely lazy, I definitely procrastinate, and I’ve just never actually tried really really hard to do well in exams. I’ve revised, but I don’t think I put in real effort ever, because I would mostly just rewrite stuff and listen to music. I’m not smart or gifted, but I want to really put in effort for once. I only have a year, How do I do this?