SBI

That won't be a major issue. If you get admission in a college. Your low marks could be overlooked if you have a good score or rank in the entrance exam.

Hello,
The bank also considers other factors like repaying capacity, collateral or as you say security, amount of loan asked. I do not think the percentage in UG matters for granting loan, but I am unsure about it.

Yes you can surely get loan from SBI. However the quantum of loan will depend on a lot many factors like your graduation score, college in which you have got admission, your requirement, tenure of loan. Banks also insist on a guarantor for giving loan. You need to check with the bank on the details and then take a call as multiple banks/ NBFC give education loan at various rates/ tenures so you need to pick the one that best suits you in terms of flexibility and rate of interest.