Rtpf are printed sets which will be given to you few weeks before mains at the centre, for practice at home. It is a part of fiitjee revision materials i.e RTPF+GMP+ARCHIVES+REVIEW PACKAGES+RET(rank enhancement tests). Don't leave any ret when the time comes. There will be around 50 RETS!!!
Non fiitjee students can buy them from dlp website at ₹1000 and gmp+rtpf combo at ₹2000 around mid November