Colleges in Lucknow

Check out this link for list of B.Com colleges in Lucknow:
https://www.shiksha.com/accounting-commerce/colleges/b-com-colleges-lucknow

I would suggest not to concentrate more on the cheaper colleges. I agree, these days, the cost of education is very high. You cannot get affordable and best colleges together. The cheaper colleges are not good in terms of faculty campus and placements. The expensive ones are much better.
You can go for DU and JMI colleges in Delhi. They have comparatively lesser fee structure as compared to the private one.

Dear Sandeep,
You've got an excellent score. Try to apply all IIMs, that will be helpful to you. If not IIML, you will get another IIM. Be positive and you will get it.
All the best.

Dear Suchita,
BBAU is doing well. For complete details, check the following web link:
https://www.shiksha.com/university/babasaheb-bhimrao-ambedkar-university-lucknow-26165
All the best.

CAT percentile is the only way to get shortlisted for a call for any of the IIMs. Other marks are considered later.

Yes, CAT score is just an entry to be shortlisted for the next rounds. Rest all depends on your performance in the upcoming rounds.