Typically, most high school students who are 16 or older work an average of hours per week. A.5 to 10B.10 to 20C.3 to 5D.30 to 40

Correct me if i’m wrong but the average of hours for high school students is B

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. 

Answerno less then (2) continuous years