What supporting documents might be required when returning to Thailand on a student visa with a re-entry permit?

The discussion focuses on the experience of individuals returning to Thailand on a student visa (specifically a language college visa) with a re-entry permit. Responses indicate that customs officers may ask for supporting documentation, such as proof of language studies or even questions in Thai to verify language proficiency. Some individuals reported not being questioned at all, while others were asked about their studies and had to show evidence of their lessons.