Panjab University

As a part of course we all had six semester and out of those six we had mathematics in four semesters. I will give my opinion in two parts, namely mathematics and other subjects (theory). Separate because I was good with mathematics and moderate with theories. For mathematics:
You will get marks for

You have to appear for the entrance after having a Bachelors degree in any discipline. Go to the official website and look out for the application, it must be available by December.

LLB Eligibility: Aspiring candidates should have scored a minimum pass percentage either at the 12th level or graduation level. The percentages are 45% marks for General category, 42% for OBC and 40% for SC/ST categories.

Master in Public Health
Bachelors degree in any discipline with at least 50% marks from recognised University/Institute. Seats: 24 (17+5 in-service* + 2 NRI).* Only regular employees in Government organisation and having atleast one year service experience be admitted under, "In-service" category.

No, you must be graduated.
But you can join BSc + BEd or BA+bed integrated course of 4 years.

You may contact the college admin for the same. To know about the course, you may refer:
https://www.shiksha.com/science/course/b-sc-hons-in-biochemistry-panjab-university-chandigarh-14306

Your scores are not bad and hence there are some chances for you to get admission. Since the competition is too high, it is difficult to say with assurance. Hence, you may try your best at the time of admission.
All the best.

Yes, it is. Actually, you need to clear the exam and entrance. All the best.