Usingenglish is a website where you can ask questions from the teachers and they reply you as soon as possible. They have a great knowledge to help the students.
I had a friend who was an MBA teacher. He was very good to help the students.
the students is right?
EX: He was very good at helping the students in my class. (specific 'students')
EX: He was very good at helping students in general. (non-specific 'students')