Engineering

No need to give any other exam because on the basis of JEE score, you will get B.Tech in CSE branch. Best of luck for your future and if there's any query, feel free to ask.

I am attaching a link here in this. You will get most of your answer of your query. You can go this link. You will get clear your doubts:
http://www.jau.in/index.php/academics-top/polytechnics-top/polytechnic-in-animal-husbandry.
Good luck.

I think, you should do aeronautical engineering from Guru Gram Institute of Aeronautical Engineering. As this is best of my knowledge and it is better in both options. So, you can go through this. You will get a good car and job opportunities after your degree.
Good luck.

At 34500, you cannot get the main campus. You will get Ramapuram campus or Vadapalni campus. The tuition fees will be 2.5L / annually.

Yes, you have a good chance to get IT in PICT, Pune. Round can't be told for sure but you'll get it in 3rd or 4rd round.
All the best.

Average package for computer science was around 4.5 Lacs per annum with the highest package of 25 LPA.
All the best.

See, this mostly depends on the the guys having ranks better than you. Automobile cut-off was 55000 rank. Last year, if you were lucky enough, you might get it.