Colleges in Patna

NIT Patna is good.
Yes, you have a fairly good chance with the above mentioned score to get a seat in NIT Patna.

No, as a matter of fact find ways to use your background. Being a science student will help with entrance exams. Try to keep up with the latest news and find ways to work on your design/sketching skills. Make a list of all the deadlines for the college's you want to apply to make sure you don't miss them.

Yes, you can either do a fashion designing Diploma or a certificate course. If you have or when you get enough technical experience you can start doing Internships to get experience/make contacts. Find local colleges around you so you can hit the ground running.

You haven't quoted your 12th marks without which one can't suggest you suitable colleges. Then also the best colleges for commerce are:
1. College of Commerce, Rajendra Nagar
2. Vanijya Mahavidyalay, PU Campus
3. A. N. College, Boring Road
4. B. N. College, Ashok Rajpath
Apart from that, many tier-2 colleges are there. For forms and admission procedure visit these colleges and ask from their reception or admission counter.

Cabin Crew Training Course allows you to get groomed and ready for the interviews which various hiring airlines conduct from time to time. Usually all such Academies groom candidates in order to become presentable in the interview. Both Avalon and PTC are comparable academies, because None provides placements. No such academy provides placements for that matter. They only groom you and help you in getting notified about vacancy announcements.

Hi,
St. Xaviers College of Management and Technology is one of the good college. Academics and infrastructure are good here. And, placement record is also better than many other colleges. Regards.

You can email the university asking them about this because the age limit criteria is over and I think they should also get over with the limit criteria.
Good luck.