hi Sneha..... i heard alot about alok sir but i took coaching from sanjay agarwal at kolkata eten ca (girish park).
no matter which teacher you choose ,your objective should be to understand the concepts well.
sanjay agarwal
to me he is a good teacher. he has his own style of teaching which is a slow but steady style .
english is ordinary but understandable. costing part is good but OR part is average.
he repeats the same concept many times which is useful for slow learners.
you can also view or revise 60 % of your classes sitting at home.
alok sir
i have no doubt that he is a good teacher but i heard from some of my friends that he is a very aggressive teacher.
some students say "he is a great teacher" while some says "mujhe kuch samajh mein nhi aaya."
so different teachers has different style of teaching and you must judge which style suits you the most while selecting a teacher.
because all the teachers are professionals and they hold very good reputations as well.
Finally ,if you fond of fast & aggressive style then go for Alok sir , if not then sanjay aggarwal would be a good choice.