What are the updated requirements for obtaining and extending an ED visa in Thailand?

An update for those who are planning to get an ED visa:

Initially, school prepares documents for Beginner level to get a visa outside Thailand. After 3 months, when it's time to get an extension and for the next 2 extensions (9 months in total) the school will put pre-Intermediate level. If you are willing to continue study English/Thai/Other language the 2nd year, you will need to prepare documents for Advanced level. So basically, number of years for one language was reduced from 3 to 2 years maximum.

Especially this information may be useful for those who already has 2 visas for the same language as per old rules..