Exam

You can apply for IIT-D/B/KGP, K J Somaiya, Management in Delhi University, BIM-TRICHY and LBS-Delhi are some good colleges you can apply to. As you have work experience you have chances of converting a premier school.

The last date will be the third week of February for MH CET.

You can try for:
ITM Mumbai
Balaji Institutes Pune
XIME Bangalore
Christ University Bangalore
Flame University Pune
MIT Pune
IPE Hyderabad
Kirloskar Institute of management
ICFAI Hyderabad
ASB Coimbatore.

75% marks are needed to get admission in IITs or NITs but not to appear for Mains exam as you can appear for Mains with pass percentage.

You can do it by limiting yourself to the important things. According to me, you should not crave for details. Focus on chemistry because it is a scoring subject and practice mathematics daily.

You shouldn’t have applied for either of them. You can apply with CMAT score of MAT February score. There will be a second round of application.

There is no entrance exam for doing UG in Anna University. Higher secondary marks are considered for UG admission. For PG, there is an entrance exam named 'TANCET'.

Check in link given below:
https://www.shiksha.com/getListingDetail/29714/institute/college-Vit-University-Vit-Vellore-India

FIIT JEE centers all across the India are best for the preparation of JEE Mains.