CBSE 12th

Afaik,
I believe the following institutions across India are the best for pursuing careers in physical sciences-
IISC, Bangalore (through boards, JEE, KVPY)
IISER (same as above)
NISER (through NEST)
St. Xavier's, Calcutta & Presidency University (boards & entrance, respectively)
University of Delhi (board marks based).

Hi Krishna,
Please mention all the details clearly such as what course, college or university you want to know about so that I can help you better. Colleges in Andhra Pradesh:
1. Andhra Loyola College
2. A. G. L. Degree and PG College
3. SVEC - Sree Vidyanikethan Engineering College, Tirupati, Andhra Pradesh
4. The Akkineni Nageswara Rao College
5. Maris Stella College
6. Tirumala Junior College

Well, videography does not have much to do with hospitality or travel. But it is a different course. There are various videography courses available, ranging from certificate courses to diploma to degree. You could try them.

Hi, yes your brother can take admission if he is passed his 12th with 50% or more but if he is less than 50% then it is difficult.
Thanks. For details visit http://www.cuchd.in/.

There are plenty of professional courses you can join other than engineering like:
Architecture
Commercial Pilot Course
Merchant Navy courses
Bachelor in Computer Application
Bachelor in Pharmacy
Career in Physics
Career in Mathematics
Career in Defence
Teaching.

You most probably will but keep your options open for other colleges as they will serve you as a backup plan. Du colleges with low cutoff lists areyour best option.

You could opt for engineering, or else you can continue B.Sc. There are various streams in engineering as well as in B.Sc. Hence, you could go as per your preference.

You can prepare for the examination by studying mainly biology subject which includes mainly agriculture-related questions. Few questions are from general knowledge section as well. Most questions are of objective type.