Exactly.. what is the point of waiting now? September is not far.. you should submit your application in Embassy by the first week of May (Just to be safer side) albeit you can file it at later stage as well but no longer than August 01. But I think, if you already got the acceptance from other colleges then go ahead. All the Govt. colleges in Canada are almost at same level... And which college you intend to join..? which colleges have extended you the offer letter?
hmm, as I said earlier, no matter which college you going to join but as long as it is a govt. college then it should be fine. Now it mainly depends upon your preferences. I don't know why exactly you going, if your main motto behind going to Canada is settlement which obviously every student keeps it in their mind i.e. PR, then I think nothing is wrong in this college. But as far as I know,it's in Peterborough which is roughly 140 kms far from Toronto so obviously it will be a bit hard in finding the part-time jobs which one could easily find in Metro or big cities.
In case you join Sheridan then what I have heard that you will hardly feel any difference which you have experienced in Indian Colleges. In sheridan, the bunch of students will be only & only Indians. So I believe, one should go to that place where at least you see some difference, you should feel that you are in a foreign country.