The test series is made by Civil Servants who have cleared the UPSC exam and at present serving in various services.
Sources of CURRENT
1) The hindu
2) pib
3) Indian Express
4) Rajya Sabha TV
Sources of STATIC
1) NCERTs
2) Laxmikanth
3) Bipin Chandra
4) Spectrum
5) GC Leong
All the Best!