So that ,as a result , I disagree with this notion
main task of teachersis to give knowledge to students, and this roleassignment have to finish in time
Some students might understand all topics that they had learnt but some aremight not
testing results are different
This problems depends on how hard study they do
This sentence is a bit of confused, may be revised as " This problem depends on the how hard these students have studied
There are some tiny grammar errors in your essays, and you may use more connective words in your essay to make it more smooth!
hope this helps you~