Should I Excuse From Study Group?

I had form a study group at my class that held from 1.30-3.30pm every Monday- Thursday. I felt it is useless and couldn't give any benefits to me nor my friends.

I had asked for teachers, friends, net friends and seniors opinions about the Study Groups. Most of them prefer to have Study Group because it may help a lot on our studies. But, what was happened on the Study Group was.. all discuss somethings that out of topics and play along the times... lesser times spend on studies.. i felt i better stay at home to study by myself if i really want to study.. in addition, we are having the study group at our class while our class always been used by other society especially the acting groups.. they always make noise that may disturb our studies.. As a conclusion, i wonder should i continue to join the study group or not.. if I should, what's the points of continuing the study group? If should not, what can I do?

I felt that the Study Group may be more efficient with the other's class student attendance because the different teacher may teach the different thing. We may combine all of the teaches and make a better conclusion and share what we have learn from teachers.. But, I have failed to acquire other class students attendance unfortunately.

Hence, should I excuse from the study group or .. ?