Hi Abhishek,

Given your marks, your probable rank will be 85,553 - 93,053 and your probable category rank range will be 3180 - 3480 . For Computer Science the closing rank last year for SC was 713 and for Mechanical it was 2105. So until and unless the closing rank falls a lot, your chances of getting into B.Tech Computer Science or Mechanical are low.

For more info on the cut off you can visit, https://engineering.careers360.com/articles/jee-main-cutoff-for-mnnit-allahabad