My 3 month old tibetan terrier girl puppy is a terror. wants to play and break and chew all day. pls help....?

I think you should walk your puppy so that it will get rid of some of his energy and at the same time you can teach her to walk on the leash in an orderly manner. If you can't walk her then maybe ask a trusty neighbor to do it for you and maybe, maybe you can pay him/her. Also you should get him lots of toys and get a little baby gate and put her behind it. With your puppy behind the little gate, you don't have to worry about him chewing your furniture and you can finally study for your exam in peace.