If you ae asking for sample questions or previous year question papers then you can make use of various educational websites and apps gradeup,testbook,unacademy etc on the internet which can provide study material and lessons . There are several YouTube videos from authentic teaching/online coaching channels which discusses and solves important and expected questions.The IBPS RRB office assistant/clerk exam has two sections , one is reasoning ability and another one is quantitative with 40 marks each. In reasoning section 20-22 and and in the quantitative section a score of 15-20 can be considered to be the cutoff bringing the overall cutoff score to be 65-70 out of 80.The 2019 cutoff for RRB clerk prelims in Tamilnadu was 68.
These are some useful links:
All the best