Is it okay for Thai students to renew their visas only 1 days in advance?

no. Thai student visa needs to be applied within 15 days. In order to avoid affecting the travel plan, it is not allowed to renew the Thai student visa only 1 days in advance. Detailed process of visa renewal: enter official website, the embassy of the country to travel, inquire or download the required materials and forms for visas, fill out the visa application form, prepare and check the visa materials, submit the visa materials and fees to the embassy of the country, and participate in face-to-face interviews or telephone calls.