hi,

see age is just a number, if you want to really work for bank po job you may definitely crack it, now coming to your educational background, if you have analyze the previous years papers of bank po exams you would know that questions generally forms on quantitative aptitude, english, logical reasoning, general awareness, numerical problems are 10th standard, but you need to practice hard and known to shortcut tricks, so if you practice daily atleast 7-8 hours you may excel it. to crack any of the exams there is only one thing to do practice and give mock test.

you may follow some books as mentioned below for preparation

lucent gks for general awareness questions

rs agarwal for numerical and reasoning

disha experts books for bank po exams.