How do I clear my doubts if I can't ask my teachers?

I'm in grade 12 rn and preparing for neet. My coaching said the syllabus will be completed by October but they have been switching teachers constantly in my batch which caused our syllabus to lag behind. Other batches are whole 2-3 chapters ahead of us in every subject meanwhile our batch is not even able to complete our test syllabus in time. Thankfully I saw this early on and switched to mainly completing my syllabus from yt videos and using the regular classes as just revision. I'm a lot ahead of my class now and if everything goes as it's going my syllabus will be completed by mid September. But since I'm so ahead i can't ask my teachers if I can't solve a question or don't understand a concept because for some reason they all seem to hate students that study online lol and they will obviously realise I have been studying online if I ask doubts from chapters way ahead of what's going on in our class. I tried ai but they are only good for understanding concepts I don't understand, when I ask them for numerical solutions it seems very complicated. I obviously can't wait for my teachers to reach those chapters before I can clear my doubts so can anyone tell me what I should do?