If you have not taken the AutoCAD quiz 00 yet, it is not too late to go and take it. This AutoCAD exercise is supposed to be taken after the quiz.
One simple rule: use dimensions to reproduce figures below using AutoCAD. You should be able to perform it with success, and remember you have all dimensions to be able to replicate them.
AutoCAD Exercise 1
AutoCAD Exercise 2
The base of the triangle below is 100 millimeters.