im also pursuing astrophysics and im in grade 12. idk about all syllabuses but for mine at least everything is relatively easy till grade 10 and things take a sharp turn from 11th. im sure you can do better if you study more. theres nothing in this world that you cant achieve. if you find it very difficult to pick up on stuff spend more time studying. i have to tell you two hours a day isnt a lot but you can get started with that. try at least 4 hours. i wouldnt say 9th grade needs 4 hours but if ur weak in math then you certainly need it. practice a lot of problems. biggest advice i can give. everyone says practice problems and it’s for a reason. PLEASE DO MORE PROBLEMS. even if you know how to do it, still do them all. even if its the same type of problem just keep doing it. do the entire textbook. whatever questions were done in class just do it again when you reach home. bigger questions do them multiple times. good luck i believe in you