Practice basic Mathematic concepts, calculations, and formulae:
Practice basic mathematical operations like addition, subtraction, multiplication, division, etc. Study the arithmetic formulae for time, distance, speed, percentage, ratio & proportion, etc.
Be thorough in concepts like square, cubes, square roots, cube roots, BODMAS, etc. Learning some Vedic Mathematic practices might be helpful.
Practice previous year’s question papers:
SBI Clerk Mains exam is difficult to crack. But anything is possible if you have practiced enough. Go through the previous year’s question papers and practice them as much as possible. Try attempting mock tests and evaluate your performance. See if you can crack the mock test on the first attempt
Revision:
No matter how much you learn, revising them is essential to not forget what you learned. You can have a hard time remembering all the facts and numbers. Going over the topics again can help you memorize them thoroughly.
Last-minute revisions are not for revising the entire syllabus. In the little time you have, focus on the important topics and put more emphasis on them. Take small notes of what you learn and revise them before appearing for the exam.