Vajiram and Ravi is one of the famous civil services coaching institute. Many even wait for the admission in their institute. The standard over their is just awesome. The faculties just give their best in all possible ways to cover all the topics and also gives tips and tricks to memories certain concepts.
The fees structure is somewhat huge I feel. And materials is like very vast. They would have covered all topics but it will be like reading a school or college text book.
The test series of vajiram is something like best. Tough to moderate standard it will be. Vajiram and ravi is one of best place to start preparing. All the best.