What is the process for extending a Non-Immigrant O visa for expatriates in Thailand?

Sharing experience on extension of stay for non imm O based on guardian of expat child studying in Bangkok at Chaengwattana. Had all the papers got number 106 at 8:27 said expect time 11:57. Noticed immediately that numbers where moving very fast entered an hour earlier than expected moved very fast once inside (considering I forgot to do two photocopies so had to go down and do them) by 11:30 was out of the place. Compared to last time I was there many more counters and differentiation from the type of extension you require. The TM30 is barely considered had mine done online and landlord did not enter the date we arrived in Thailand just the registration date was showing, no questions asked. I saw a real change in efficiency and speed! Much less of a nightmare than previously.