The first important step is to master all the subjects covered by the GMAT. You should also develop your communication and personal skills to become an influential and sought-after tutor. It helps if you can consult other GMAT tutors, read as many GMAT textbooks as you can, and teach students part-time. Once you’re confident of your tutoring skills, sign up on Airtasker to get more online GMAT tutoring jobs.