Colleges in Ludhiana

It is hard to compare because both are good colleges. But if I were at your place then I will go for BIT-Dhanbad as it has good infrastructure and campus environment.

The eligibility for BBA in Khalsa College is:
The candidate must have passed 10+2 from a recognized board with 55%.

NCERT books or for reference Pradeep,'s book ,Dinesh book,arihant ,is good

Yes, you need to appear for the entrance exam irrespective of the marks you have scored.

It is available on their website and past rank records. Still, you may check with your marks in College finder sites like here in Shiksha.com.

Baba Khajandsa College of Technologies
CT University
Punjab Agricultural University
Lovely Professional University
Punjab College of Technical Education.

Eligibility for M.Sc. in Food Technology:
Candidates wishing to apply for the course need to fulfill the following eligibility criteria:
Graduation completed from a recognized university.
A minimum aggregate score of 50% (45% for SC/ST/OBC candidates) at the level of graduation.
Graduation needs to have been completed in any of:
Chemistry
Biochemistry
Botany
Zoology
Microbiology
Biotechnology
Home Science
Agriculture
Food Science and Nutrition
Food Technology
Candidates awaiting their graduation-level examinations results are also eligible to apply on provisional basis.

According to me, JECRC then Poornima, then Arya but I will suggest not to go in this college if you are eligible for LNMIIT, MNIT, BITS PILANI you can see the placement record and faculty staff from their college website you get better idea about the college.

There are 2 courses offered in PAU: M.Sc Food Technology and MS Food Science & Technology. For admission in these courses, you need to have B.Sc in the same subject to be eligible for this course.