Of the 168 hours in a week as a full time student you should spend how many hours per week on school work?

Firstly it depends how many school subjects you have. The average time needed to study according to a recent research is 2h per 1 held school lesson. So if you have one lesson 4 times a week, you should study on average 4*2=8h per week for that subject. This is a rough estimate, i can say. According to me it depends on your efficiency, health and intelligence. I will be glad if you try to study efficiently, look on your health and be dedicated to what you do, because than you can do better.