I have studied mathematics at Chrome IAS from Bhavana ma’am. Chapters like Modern Algebra which are considered a burden for all those preparing even for 3-4 years, were explained so lucidly by her. I haven’t seen anyone else even close to that.
The best part about her teaching is that you would actually understand the logic behind maths which is very critical to even think of getting good marks. Her notes are crisp and comprehensive.
If anyone is interested in taking maths as an optional I would suggest to study from her.
My friends at Delhi University tell that across the university students leave their college classes and count on her notes/lectures. I don’t blame them ????