coroneos is mostly pretty basic though, although HSC hasn't really asked any integrals that have been too tricky in the past few years, it's good to be prepared.
For me after I went through the theory and textbook questions for a topic, I'd do past paper qs for that topic (a compilation of past paper qs by topic would help save some time), then I'd try to find tutoring resources/papers (questions from tutoring centres are usually the most unique and...
Maths the best way to study imo would be to grind out different questions and develop your problem solving skills (once you've actually learnt the content ofc).