Quantitative aptitude for Competitive exams. Everything covered in the syllabus and out of syllabus.

A Well good teacher who handles the subject well and humble knowledge into the core with the subject..

He's good in explaining doubts

He is a good worthy teacher because he understand the concept and moreover he would teach his own method of style.
And also a coding genius
He would teach the computer concept innovatively which students can understand quickly.
Narendheran used to give many shortcut technique in maths to solve problems.
In coding for one question he has many solution and more understandable coding to give the result

Yah its good try ,You are intelligent boy,you are good at mathematics,Go ahead ,All The Best