Grammar, Usage / Correcting mistake in making statement [3]

hi everyone,
I have been learning to write accurate in English, I hope you would help me to correct my mistake in making statement.

thank you for all comment and I am happy with it.
" first thing that I want to mention is how the lesson was successful. for me, the teacher role is impart the knowledge to student, the most successful lesson is not only a good preparation but also motivate student to join all activities in class"