UPCAT

You can predict your college here-
https://googleweblight.com/i?u=https://www.shiksha.com/b-tech/resources/upsee-college-predictor&hl=en-IN

For the list of probable colleges you can get, check the predictor below:
https://www.shiksha.com/upsee-college-predictor.

Yes, there is an option for changing the preference of the college. Take a look here:
https://upsee.nic.in/publicinfo/Handler/FileHandler.ashx?i=File?=251&iii=Y

Sorry but you cannot get admission in IET, Lucknow. But try in BIET-Jhansi, KNIT-Sultanpur or IERT-Allahabad.

There is no option to withdraw till first round of counselling.

5th July is the last date.

Yes, in second round counseling, girls quota considers as rank for college allotments.

So that you think twice before taking any back step. In previous year, it is observed that there are a lot of students withdrawing after getting a college. And, it is not good for any board. That is why they did this, I think.

No, as your rank is not so good. You should try few waiver seats of good private colleges or you can go for other government institutions like Purvanchal, Rajkiya colleges, etc.