Science

You can do that, if you have chemistry, as one of the major subjects, as in B.Sc, Life sciences or B.Sc. Physical sciences.

It is best, if you pursue MBBS from abroad (European universities are also good), but make sure those are MCI recognized. In India, it is difficult to pursue MBBS from private universities, because of high tuition fee charged by the colleges. Dropping a year and preparing for NEET will not be a good

Yes, best 4 percentage matters.
You just need to have a passing mark in the 5th subject.

Cyber Law Questions and Answers | Cyber Law Mock Test - Vskills
https://www.vskills.in startPracticeTest
Practice mocks, because last year’s question papers aren't available.

B.Sc Nursing is not included in NEET, so forget seat in nursing, you will have to go through the entrances.

Sorry, but you can't apply for KVPY. There are 3 streams SA (in 11 class), SB (in 12 class), SX (First year of Bachelor course), but you still have other options, like if you will be able to get admission in integrated Ph.D course, then you can get a fellowship from the institutes, but there are few

There are different exams such as JAM, GS, JEST and many other state or central university exam through which you can get admission in Masters or Integrated Master courses and most of them do have a syllabus of Bachelor's course where GS and JEST little bit more advanced syllabus, but questions you'

Food Science will be the best option for you. Since you are already a Diploma holder in the related field.

Technical courses cannot be pursued through distance. The AICTE does not approve such courses.