Basically I have taught for 5th to 10th standard in India so first I used to make them to learn the concept of the problem like first I used to make them to learn formula and I used to explain a example on black board and then ask them to solve the exercise problems if they are unable to solve I used to explain them again and again so that they can learn easily and I used to share my personal tricks which I learned so the children used to solve the problems I can teach calculus of intermediate level as well