How can I score more than 90% for a B.Tech in JNTUH?

I will shed some light on the university exams situation at JNTUH. It's almost impossible to score good marks here because irrespective of what you write the correction staff simply gives you zero. They don't care what you have written and when you write the same answers in your supplementary exams, you end up getting passed. This is the reality here where the toppers fail in exams while the failures top. 

If your aim is to get 90% here, I will suggest you have a change of mind. Stop focusing on mere percentages and rather focus on gathering as much knowledge and skills as you can. Eventually, recruiters don't consider your grades but your knowledge and performance in the interview. At JNTUH, you get marks only if you write the exact words from the textbook even if it means you don't understand a single word. I will mention a few simple tips that will help you score decent marks here:

1. Always write the answer in points; each point comprising 2-3 lines. A long answer should have at least 10-15 such points.
2. Underline the keywords in every point and highlight the main points.
3. Make sure your answer sheet appears organized. Use margins, draw a line after each answer, highlight the formulae, etc 
4. Presentation is very important so dont strike off the answers as you may end up losing more marks.
5. Write the long answers carrying 10 marks in 4 pages, short answers carrying 3 marks in 15 lines, and the 2 marks answers in 6 to 7 lines.

These tips will help you survive at JNTUH by getting decent marks but won't help you in increasing your knowledge which is very important once you leave college. So work on that as well!