The best thing about Hansraj Sir is that the way he teaches you, first he clear the concept abt a specific topic and then he gives you a printed assignment of topic wise questions of that topics and then solve the question in the easiest way.
If you are a newcomer in the field of ssc cgl preparation, then go for rakesh yadav sir class notes which is available in the form of a book, once your concepts are clear then go for Advance and Arithmetic maths book.
Best things about Ramdev Bhati sir is that if you are week in Geometry after reading from him you are a expert in Geometry.
Bharti Sir is also a best teacher in Mukherji Nagar, he completed Maths almost in one year.
Mohit Goyal Sir Online Videos is popular among Mukherji Nagar Students.
Thank you for valuable information.