An infinitely long nonconducting cylinder of radius r = 2.00 cm carries a uniform volume charge density of 18.0 micro-coulomb/cubic meter. calculate the electric field at distance r = 1.00 cm from the axis of the cylinder

It depends on the subject for me. some exams are easier than others so i usually go through it and answer questions i know based on my general knowledge, then double check after. going through the lesson can a lot  because the exams can be  very lesson-specific, but sometimes they are ridiculously long so a lot of people don't take the time. i did find that, when i went through the lessons, i was making 100's on my exams vs strictly using + the internet and  i make 90's. 

Well, technically um like well