English speaking Biology teacher(upto Bachelor level) available in Munich-Online lessons are possible too.

Methodik

I prefer to give an overview to the student about general structure of the topic under discussion. Before that, it has always been too good to relate the topic to real life world to make lesson interesting.
secondly, I have always found it helping to take feed back from students occasionally to asses their level of understanding. Mostly feedback is taken in form of questions in middle of lesson.
Individual counselling in matters other than study are always helpful.