The student can send papers to the teacher to have corrected. The student will be given grammar exercises to do for homework taken from the grammatical errors the student has made on the papers sent to the teacher.
I have extensive experience teaching Business English. I have taught the current President of Spain, Jose Luis Rodriguez Zapatero, and many directors of banks, pharmaceutical companies, oil refineries (Repsol, Shell...). Also, I have taught and currently teach non-native children, adolescents and adults General English, helping them prepare for different tests such as the IBT TOEFL, First Certificate, Advanced and Proficiency Tests.