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BYJU’s IAS is a well-known institute for UPSC preparation. They have a good record for students getting selected in the top ranks in IAS, IPS, IRS, IFS and many other UPSC exams. The notes and study materials are given by BYJU’s IAS Institute for the book of Concept of System is very helpful for UPSC aspirants. This Concept of System book published and supplied to students by the BYJU’s IAS is a must read for UPSC aspirants.