Science

Please check for your eligibility to appear for the IISER entrance test from the criteria mentioned at the link provided below:
https://www.shiksha.com/science/exams/iiser-entrance-exam.

Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, [SKUAST] Srinagar is the only university that offers B. V. Sc.

TS EAMCET 2018 College Predictor
Use your TS EAMCET 2018 rank to see where you can get admission at the link provided below:
See the courses, colleges & rounds you may crack
The result is based on admissions data of TS EAMCET 2017
Get resources & insights on colleges & courses
https://www.shiksha.com/b-t

Yes, you can join aviation after completing your B.Sc. You can join any good college for aviation. After doing this, you can increase your chances for getting a good career ahead. Good luck.

Yes you can, but you cannot get good colleges as your marks are low. Anyway, you can try by applying numerous good colleges. Good luck.

In Physics:
University Physics Resnick Halliday
University Physics Sears & Zemansky
Problems in General Physics Irodov
GP Thomas Calculus for Beginners
Organic Chemistry Morrison Boyd.