Hello Sagar,

To get computer science in MNNIT ALLAHABAD,it will be good if you atleast score 220 in jee mains.Because this will keep you in a safe side to get better priority.With this score your rank will be  around 4500 .With this rank you can get cse in the subsequent rounds which are conducted at in 5th and 6th stage.But if you want to get it in the first round only then you should try for 250 as this wil put your rank around 2500 .

To get more details use this link below:

https://engineering.careers360.com/articles/jee-main-cutoff-for-mnnit-allahabad

Hope this helps you

ALL THE BEST