Engineering

No, the overall percentage matters while taking admission in any college, for admission in government college you should be either in top 20 percentile of your respective board or above 75%.

Yes, not in first rounds though.
Later, you sure have a chance.
All the best.

Apply for PICT-Pune or MIT-Pune. You stand a good chance to get admission in these colleges.
All the best.

Considering, you're from general category, you won't get old NITs with these core branches unless you have home state quota. In new NITs, you can easily get the core branches also apply to Delhi college counselling because with this rank you also have opportunities for NSIT DCE and IIIT Delhi and th

Hello there,
For better future, I would suggest B.Tech as graduation and photography as a part-time certification course, benefits from this is you don't need to struggle anymore to get a proper job in photography.

Yes, you can easily get that stream without any problem and you can also get admission in IITs.

Yes, mathematics is must for the CSE. You need maths irrespective of the branch.

This is TNAU's admission brochure link. I hope you will get all the required information here.
http://tnau.ac.in/admission/Information Brochure 2017.pdf