i recently called thai embassy in Qatar to know about visa formalities. they asked me to fill 3 visa application forms with 3 photos and relavent documents for applying visa. earlier i used to fill just one for, im bit confused regarding this matter. when i tried to call embassy official, their reply were not satisfactory and even send several mails to immigration department without any reply. i also want to know in case if i want to extend 60 days tourist visa at immigration office for further 30 days is it possible as indian passport holder?

Needing to complete 3 application forms appears to a requirement for everybody. See: http://www.thaiembassy.org/doha/en/services/1703/25507-Visa-Announcement.html

You will not be able to get a 30 day extension. It is a immigration rule that Indian's and those from certain other countries do not qualify for them