How should I develop a good profile in order to crack PGDIE from NITIE?

One of my friends cracked it last year. So I might be able to give you some information about it.

• NITIE has successfully attracted the best talents and has always been in a student's top choices.
• During the admissions process, NITIE questions candidates on a variety of parameters.
• In my friend's case, he was asked a slew of questions about his engineering knowledge, summer internships, extracurricular activities, and hobbies, as well as the standard ones about why he wanted to attend NITIE.
• Like in any other B-School, there is a stipend for every achievement of a candidate. The winner achieves a set score level.
• I would say that excelling in one field is unlikely to get you through; knowledge of all fields is required to pass the test.
• In order to pass the exams, you should be good in analytical and problem-solving skills, which typically come from good mathematics skills. 
• Communication skills are also an added advantage.

For your current studies, if you are using high-quality reading materials from top publishers, that should be sufficient. Aim high and you will succeed. Just keep working hard.