UPSC Prelims Mock Test series for UPSC Civil Services Exam by UPSC Prelims App UPSC Prelims test series for IAS Students to prepare for the UPSC exams. UPSC Prelims Test Series App Page is Created to give Premium Test Series of all the big institutes for free for all the hardworking UPSC Civil Services IAS Aspirants. Here, all major UPSC institutes Prelims Test Series are available for Download and people can take Mock tests of these test series without any cost and anytime of their convenienc