In the cases of Lakshman Sintre v. Balkrishna Shetye, BLR page 937 and B. R. Oswas v. Laxmibai, BLR page 214 it was decided that when residential premises are used for dwelling as well as for business office purposes so however that the dominant user still remains residential, it would not be in breach of the bye-laws and regulations of the society as there is no change of user involved.
2) you can use residential premises for running tuition classes