But this is my first drop year

But this is my first drop year and i have got approximately 140-150 marks in jee mains April 2019

As i already said that first of all you need to score 75 percentage in cbse , if not than it doesn't matter how much you got in jee advance.Now the only thing left is that u can go in private colleges.And can you please tell me that why didn't you asked your que when you got your boards marks.if your boards marks were low then you must had applied for re exam of board.now i am sorry nothing can happen as the time had passed for 12 th re exam.

I have gotted 60% in BIHARBOARD 2018

Ok than for bihar board you have to get 20 percentile. So if you are general than 293 marks.for obc /ncl 287.for sc 279.for st 284.so if you had got more than above no. According to your category than congo you can get iit colleges according to your ranking