You can do your TESOL Certificate online. The material will be delivered to you online and you will be able to study for the test on your own pace and take the exam as you please. This does have the disadvantage of missing the class environment and a teacher is not physically present to answer your query right away and you will have to wait for a reply via email.
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You can also attend classes for TESOL as these are offered by various institutions. You will have the advantage of being able to interact with a teacher and with peers if you have a query, you can get an answer right there and then. Make sure that the institution that you take an admission in is accredited.
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Your best bet to get the ideal teaching will be at a local college or a university that offers the program. They will have a qualified and experienced faculty and will be better equipped to prepare you for the test. You are likely going to do better at the test after taking your class in a thoroughly professional setting.
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