It is an exhaustive preparation module which covers RRB Group D and PO exams.This crash course is divided into two parts E-Test (Take unlimited mock test) and Analysis (Current level of preparation and expected rank).
Yes, it is definitely useful for those who are already taking coaching. It prepares them with the help of unlimited mock tests. E-Tests in it gives you a real exam like simulation. Its analysis is far more in depth than the one given by usual coaching institutes.
It can be extremely useful in revising the whole syllabus, as every important aspect of the exam has been covered by it. The practice questions in it are exhaustively and accurately made by experts, based on actual exam pattern.