IN HOW MANY WE HAVE TO APPEAR IN IMPROVEMENT EXAM AS PER RULES OF NIT, IIT TO GET ADMISSION IN 2020.
Hello,
By improvement examination, do you mean boards improvement examination? If yes, then in order to be eligible for admission in NITs, IIITs and IITs, you must have an aggregate of 75 percentage in CBSE Boards or you need to be in top 20 percentile of your respective boards. If you want admission in IITs in year 2020, you must have appeared in boards in year 2019 and you can give improvement examination in year 2020 only.
I hope it helps. For any further queries, ask me in the comments.