thanks sushmita for a2a.
here is the myth that i would like to burst that you can not prepare solely for OBC banks exam.
you will need to prepare for all the banks exam simultaneously.
as the course and syllabus is more or less on the similar fronts.
you can refer to tests available on the youth4work portal and also on the unacademy or youtube sometimes as well.
Do read NCERTs of maths if your maths is so weak or if your concepts are in place then you can directly see some formula sheets and directly head to test taking which would be much more helpful. like time4education IMS CL.