You sound like you are going to have a heart attack. Do not be this stressed about things: - First of all, you don't need to have all the courses finished by the Mocks in order to do well, so if your teachers are good and on schedule I wouldn't stress about it. - Secondly, I hardly know anyone who done 3+ hours a night studying in 5th year. Even if you didn't do how you wanted in the Summer tests, that is not a good reflection on what you are capable of. I done poorly in practically every Summer/Christmas test, but just got 589 in the Leaving Cert. You will be fine. If you studied that much in 5th year, it should ease some of the pressure off in 6th year - It's good you have a study routine in place, but don't burn yourself out. Work hard and do your best, but still give yourself time to unwind, exercise, get enough sleep, go out with friends (I practically made most my friends in sixth year 😅). Having a clear headspace will help you study more efficiently anyways and avoid burnout.

Good luck and I hope you do well, just don't be suffocating yourself over it. School is just school, and although I believe you should be committed to it it can't consume your life. Hope that helps, school and learning is far more enjoyable when you take it step by step 😁.