I have registered myself for NMAT,CAT and will be registering for XAT,TISS,SNAP very soon.
These exams are sufficient, just focus on this only coz if you are oursupuryiur graduation ,so I suppose your semester exams are also gonna take place in Nov end or 3rd week of nov and That's imp too.. else if you want to take other options, you can go fir CMAT and IBSAT
You are up for a huge climb since you applied for almost all the exams.
To answer, no you do not need to apply separately to any college as of now, once ypur results are out you may need to think about colleges. As of now concentration on exam would be the thing to do.
Study well with all the dedication and concentration you have. Perform well and come out with flying results.
All the best
Test forms will be sufficient only.No need to apply for college level forms.These are still too much for you.
Study hard and i wish you crack all of them.