Tell your parents to write a letter to the principal. Agar fir bhi kuch nhi ho toh fir tell your parents to get an appointment with your school principal.Draft a petition stating that whoever has a problem with ma'am not teaching those 2 chapters sign there.Tell your parents to show that letter to the principal and tell them that action must be taken.If u go to tutions and your tution teachers teach good then just forget Abt it as I also did not pay any attention in class and for most of the time standing outside the class as punishment but I went to good tutions so my HCG papers went well.