Dear Priyanka, you haven't mentioned your Category. Neverthless, an estimated cut off for each Category for each section is as follows:

QA                 DLR             VARC               Overall

General Category        70                     70                  70                   80

OBC-NCL                       65                    65                   65                   75

SC                                   60                    60                   60                  70

ST                                   50                     50                  50                   50

PWD                              50                     50                 50

Hii aspirant ,

Coming to your question I would like to tell you that yes it is necessary to study  physics as a compulsory subject in the ISI B maths course , as you are going to be study this subject in your 2 nd sem of your degree for

Although ,Nit Delhi and iiit kota are government college ,As far as college culture and academics are concerned I will say lnmiit is better over other two as it is established much before iiit k and nit Delhi and now opportunities are vast as of now coding culture of lnmiit

Dear Aspirant 

First of all Congratulating you on your nice performance that you deserve both of the nice college and I would like to tell you that based on two choices and preferring college over branch then NIT allahabad is under nits and a nice place to persue your b.

Dear Aspirant 

First of all Congratulating you on your nice performance that you deserve these nice college and secondly I would like to tell you that based on three choices if you were to take my opinion then I would suggest you to take admission in MNIT allahabad with ME

No female only seat is not available in csab special rounds. You can see home state quota opening and closing rank. Your st rank is good enough to get a seat in nit. You will get nits like raipur, Ranchi, Rourkela, Punjab, Andhra pradesh, silchar, Durgapur 

Hi

Tough. Honestly, you cannot make your end meet at MNIT Jaipur. Your rank is quiet high to get anything there. 

You can always check the same about JEE Main Cutoff for MNIT Jaipur in  a greater detail through this link: https://engineering.careers360.com/articles/jee-main-cutoff-for-mnit-jaipur.

Best of Luck.

Hope this helps.

Cheers!

Hi

Date expired implies that you have not reported at the reporting centre. Haven't you FREEZED your choice? If you haven't done that, unfortunately nothing could be done to take admission there. No one can help you in this case. You should have been careful with the dates. The authorities