High latitudes (and polar regions) are colder than low latitudes (tropics, equaton) mainly because a)day lengths are shorter B) of low/oblique Sun angle C)reflection/loss of the Sun's energy is enhanced by snow/ice D) Sun - Earth distance is longer​

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. 

Uh whats the