Hi Aspirant

Barc relases separate recruitment notice for diploma holders and B.tech/B.E graduates.Being a lateral entry student you can apply to both until you are in final year.If you are passed i.e if you are graduated then you can apply to B.E/B.tech graduate application. 

Barc releases notice for eligibility criteria for each recruitment you can check the details about it from the official website of BARC.

Barc recruitment  for OCES/DGFS is through gate exam .If you will appear for gate then you can apply for it .This application is for degree students i.e for B.Tech/B.E.You can read more about it here by visiting the link given below:

https://engineering.careers360.com/articles/barc-recruitment-through-gate

You can fill the form here: https://www.i-register.co.in/BARCREGENG19/frmdeclare.aspx

All the best.