Running private tuition in flat is not commercial activity
2)
since you are staying in said flat you can use part of flat for tutions
3) Supreme court had categorically stated in the case of Pant Nagar Anandlok CHS Ltd., at Ghatkopar, Mumbai, (Appeal No. 550 of 1985 decided on [deleted] decided by the MSC Appellate Court) it was decided that carrying out activities like conducting yoga classes in a residential flat does not constitute breach of bye-laws of a Co-op Housing Society.