The minimum percentage for being eligible for jee mains is 75% in CBSE.
It may change with change in board.

Hello dear student, 
For getting a seat in NIT  or IIT , the eligibility criteria regarding marks in 12th board examination is that student should have got at least 75 percent or more .
With 69 percent marks you fail to fulfil this criteria, so you can not get NIT / IIT .
THANKYOU
PLEASE feel free to ask your further queries if any.

Hello ,
Candidates appearing for 10+2 or equivalent exam in 2019 are alsoeligibleto apply irrespective of their age. Candidates must have passed class XII orqualifyingexam in 2017 or 2018. Candidates appearing in class XII or equivalentqualifyingexam in 2019 can also apply forJEE Main.Hence according to this you will not get eligible for the JEE mains counselling if you belong to a general category.Otherwise you will be rejected.Hope this answer helps.Thank You.

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