1. Write down all your lingering questions like you would for a to-do list so you don't have to keep everything in your brain
2. If Google doesn't help with finding your specific question, then try ChatGPT but you have to be careful with using AI because it doesn't give 100% correct answers. You need to assess the answer with your own understanding and ask your teacher whether it's correct.
3. If the above doesn't work, ask your teacher/tutor.
4. If you have tried all of the above, move onto the next question. No point spending hours on a specific question. You only have so much time for during HSC.