Physics Spl

Firstly, it doesn't really matter from which college you are(nor does its ranking). all you have to do is get a Be-Tech degree with 60% aggregate and clear JEST.
Now simply looking at the sample paper/syllabus will not get you through the exam. JEST covers the entire B.Sc physics syllabus and that's not a walk in the park.
books, books and more books are your only tool and so start READING.
Given below is a link from where you can get the list of recommended books for JEST
http://entrance-exam.net/syllabus-and-reference-books-for-jest-physics-exam/
My personal advice for the starting reference would be the "The Feynman Lectures on Physics." .

There many career options After B.sc in Physics but if you are interest in Physics/Science stream related career than it would be better if you opt for M.sc in Physics and than do PhD in subject as it often seen than Physics Post graduate and PhD holder are required and earning very well who are employed in Govt or Private research and Development organization such as Indian Space Research Organization, National Remote Sensing Agency, and Space Application Centre and so on.
Various Technical jobs are available for Physics graduates/post graduates like- radiation monitoring, electrical power plant operator, scientific instrument operator
Sales Person for technical instruments
You can also work in Govt and Private Laboratories
After PG in Physics you can apply for NET/SET examination and can teach in Govt or Private Colleges.
After Doing B.ed you can apply various Govt or Private Schools
You are also Eligible to apply in
Union Public Service Commission for Posts like IPS , IAS , IFS
Staff Selection Commission
Indian Forest Services
Banking Sector
State PCS
Indian Defense services
etc.

After finishing 12th Science stream schooling, one may go for undergraduate B.E. or B.Tech. Engineering program. The course duration is 4 years. After B.E./B.Tech., one may also go for M.E./M.Tech., which is master degree course in Engineering! M.E./ M.Tech. program lasts for 2 years. Some of the prominent branches of Engineering are-
Mechanical Engineering
Electrical Engineering
Civil Engineering
Chemical Engineering
Computer Science Engineering
IT Engineering
IC Engineering
EC Engineering
Electronics Engineering
Electronics and Telecommunication Engineering
Petroleum Engineering
Aeronautical Engineering
Aerospace Engineering
Automobile Engineering
Mining Engineering
Biotechnology Engineering
Genetic Engineering
Plastics Engineering
Food Processing and Technology
Agricultural Engineering
Dairy Technology and Engineering
Agricultural Information Technology
Power Engineering
Production Engineering
Infrastructure Engineering
Motorsport Engineering
Metallurgy Engineering
Textile Engineering
Environmental Engineering
Marine Engineering
Naval Architecture