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.

Yes, not only SBI but every bank provides study loan at about 10% p. a interest.

Dear Komal,
You need to pay the entrance exam fees through challan or online mode. You can transfer the amount from any bank account you have irrespective of which bank. You can visit the nearest SBI Bank and deposit the amount scan the Challan and send it to the college. Or, tell me more about the problem you're facing so I can suggest you better ways to make the payment before deadline.

You can consider following books:
Magical Book on Quicker Mathematics by M Tyra.Quantitative Aptitude by RS Aggarwal.SBI Clerk chapter wise Solved Questions- Kiran Prakashan for quantitative aptitude.