JEE Main

I'm providing you with three video links which can be very useful for you:
https://youtu.be/K3lviiNR0pI
https://youtu.be/PEOpYDfNY-4
https://youtu.be/e_P5c_HJUNU
I want to suggest you that please aim for 250 as it is a secure score, you will definitely get admission in the colleges such as DTU, NSIT or NITs otherwise there might be chances that at the end you will not get your desired college. All the very best from my side.

It depends on you as if you are satisfied with the college and branch, then you can freeze the option and pay rupees 5000.

You are not eligible for admission into any college through JOSAA counselling.
There is no chance of getting any thing at verification also.

NIT-Trichy, NIT-Warangal, NIT-Calicut, MNIT-Allahabad, NIT-Durgapur.

Probably, in internal sliding or in last round. But, chances are very low. Although in 2015, last candidate was around 9500 (after every round that did happen including internal sliding), but can't be sure for this year.

The only problem you may face is relieving letter from college. As you are already enrolled in a private college and also with university so they might demand full four year fees from you.

To get admission on any IIT's you have to good rank on JEE(ADVANCE) or for NIT's you have to be meritorious on JEE (mains). then according to category reservation and cuttoff can get admission.

You can easily get CSE in UIET. You won't get any branch in PEC.

Obviously it is JIIT, Noida.
Second priority will be JUIT, Solan
And, last will be JUET, Guna.

I guess, it would be a bit difficult for you to get a branch in SGSITS, but you can wait till last round. You can also check last year's counselling results, it will give you a better idea.