If you are preparing for IIT JAM 2019, then it is for sure that you must have experienced the same question. Whether to go for standard books or a study material. Well, the answer depends upon person to person and also what is the motto of the students. Whether they just want to crack the exam or want to gain more knowledge. Get the complete comparison at:

http://iitjamexam.blogspot.com/2018/...jam-study.html

All the Best