Maths

I am an asstt. teacher (maths) by professsion. I have cracked various exams like ssc cgl, psc(wb) clerckship exam, psc miscellaneous and appeared wbcs main twice. Someone has rightly said, " The best part of Learning is Sharing what you know". That's what I am trying to do and I am still learning . If you find any mistake or if you have better solution or any suggestion then please comment below.