Hi

Your profile suggests that you are from Assam, so assuming you would have done 12th from Assam so you will be eligible for home state quota in NIT Silchar

With 70 percentile

• your rank will be around 306900 - 345000 as per our rank predictor at

  JEE Main Rank Predictor 2021 - Predict your JEE Main ...

  JEE Main Rank Predictor - Know your expected IIT JEE Main 2021 Rank by ...

Your st  rank will be around 8k

I am extremely sorry to tell you but with above predicted rank you have a very low chance in NIT  Silchar in mechanical or any branch even under  home state quota

For example,

In 6th round of josaa counselling 2020, closing rank for gender-neutral  for st category was  2314 st rank for mechanical engineering under home state in NIT silchar .

You can check the same at

https://josaa.nic.in/Result/Result/currentorcr.aspx

This  prediction is on the basis of past year cut off data but  cut closing rank changes every year depending upon  number of candidates that write jee main examination, difficulty level of the question paper for different shifts of jee main etc so

To have a personalised report on your chances of getting a college you can go through our college predictor, it will give you complete list of colleges which you can get on the basis of the category you belong to,  your home state, your gender etc, the link for  jee main college predictor is provided below

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

Thank you