Hi I am facing problem with the RC's.I am easily able to solve easy and medium level questions but having 0 accuracy in solving hard questions. Can you please guide how can I make that better?

Hi, try to analyse which type of questions are you answering wrong always. For example, if you're not able to answer the inference based questions, take more topic tests on that topic from the Study room.
Read the solution carefully and try to understand the author's viewpoint. Do this for every RC you solve and Read regularly. Accuracy will improve over time.