Welcome in ILPINTCS,
TCS is checking your academic like B.tech,M.tech(if u have),10th,12th,Diploma(if u have).
Basis of all the score ..
TCS compare with other associate of waiting for joining letter .
If You have certification in any programming language, Then You will get Advantage to getting respective certificate TechLounge.
Try to collect certificate with Official company.
This is one of the factor..
This point you have done earlier so not able to change.,
See here other factor