CAT

You need to get 99 percentile to get in to IIMs.

You can do as much model test papers on the coaching institutes.

Yes, you can definitely do Information Technology MBA course.

https://www.shiksha.com/mba/articles/colleges-accepting-cat-score-above-85-percentile-blogId-19571#:~:text=A: The top public MBA, and Delhi School of Economics. Check this.

Which college you are talking about please elaborate on your question.

Low marks in graduation don't affect a lot if you want to do Masters then first you have to filter all the entrance examinations that are suitable for you and try more to fo better in this and prepare for the interview as well because the entrance exam has almost 60 - 70 % weightage and almost 10-20% interview and rest are academic and extracurricular so start preparing.

You should go for IMS Ghaziabad where CMAT scores are taken for admission and there you get better placement opportunities in finance and recruiters like Deloitte, ICICI bank, Accenture, Wipro are recruiting finance students.

Hello!
No, you can apply for CAT exam when you are in final year of your graduation. The year of 2022 in the final year of your B.Sc. Degree. So you will be eligible for appearing CAT examination. If you qualify in that CAT emanation you have to submit the final year result at the time of counselling. Hope this helps.

You can give MAH CET or GMAT for JBIMS.

As your question already states, you have a low CAT score and NMIMS is currently considering its own NMAT score for admissions. If your CAT score is low and you want to get admission in NMIMS I will suggest you to apply for NMIMS test and target a score of 210 or plus for admission in NMIMS.
Thank you,
I hope my answer will be helpful.