UPSC prelims mock Test series app which is by the name of UPSC Wallah is one the best app for upsc civil services examination preparation. To select qualified candidates for various civil service positions such as IAS and IPS, IFS and IRS, the Union Public Service Commission conducts its renowned Civil Services Examination. It is one of India's most difficult exams due to three steps in selection process - primary exams followed by interviews. Millions take this examination every year in prepar