I will help you/someone you know in understanding many mathematic/physic lessons. I gave many private lessons when I was still a student. I also needed one time teachers in order to succeed in France entery exams for engineering universities, but the teachers didn't have a proper approach: they want us to understand like them. But during my given lessons I learned how to see the problems and difficulties like the student, by listening to him, and working on a road to the solution that he can see, too.