If you need anything, don't hesitate to ask. I am here for you, and it's free of course.
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It depends on many variables, including, but not limited to, what you are learning/focusing on, who is supplying the materials, the length of the sessions, the class size (whether it's a private session or a group class), the qualifications and years of experience of the teacher/tutor. However, $6 is the equivalent of B180, which is incredibly cheap, even by Thai standards.
I specialize in Test Prep (SAT, ACT, IETLS, TOEFL, etc...), and I usually charge more (although I try to be fair), but I also have 15 years of experience in the field, and I don't only teach English. I help IB students with their college applications, their TOK essays, and their Extended Essays. I also help undergraduate students with their papers (editing for clarity, coherence and lexical resource).