B.Sc

Kindly visit this link:
https://www.shiksha.com/college/m-g-science-institute-navrangpura-ahmedabad-5792

The cutoff marks vary from college to college every year and are generally based on the all over 12th result. You got 94.2% which is a good percentage and I think getting admission in the best DU college for B.Sc would not be hard for you as generally the cutoff is above 90% for best colleges in DU.

Depends on University norms. Yes, definitely you can get admission if you get good marks.

B.Sc + M.Sc Electronic media is offered at the college, as an integrated course for a period of 5 years.

You can explore website for more information regarding this college.

You have to contact the university directly and consult them regarding the procedure, as it's definite that they don't conduct any online examination.
All the best.

Yes, you can definitely get admission for B.Sc Nursing course, as you fulfill the minimum criteria of securing a minimum of 50% of marks in aggregate. All the best.

Yes, any student who successfully completed B.Sc can apply for M.Sc in respective streams depending upon eligibility in different Institutes.

Yes, if you have completed B.Sc, then you are eligible to apply for M.Sc. Based on your choice of stream depending on eligibility.