What Are the Requirements for a Non-B Visa for Teaching from the Royal Thai Consulate in Chennai?

Hello members.... is there any Indian here who go their non B visa done in Royal Thai consulate general CHENNAI? Especially for teaching. When I had gone through different websites of Thai consulate generals in Vietnam, Cambodia or Laos they have mentioned separate list of documents required for getting non B visa for teaching job. But in Chennai consulate, NO. So, my questions are

1. What documents I need to submit for non b for teaching.

2. What's the probability of getting approved? Some of my friends said it's very difficult to get visa from Chennai consulate. Is that true?

3. This is my second time applying for non b. First time was done through an agent, from Mumbai consulate. Now I'm going to apply at Chennai consulate. Is it acceptable to change the consulate? Or is it going to create any problem?

Any response is helpful for me. Thank you very much 😊😊😊