I see that you have an
Alphion ONT, unsure how that can be set in bridge mode. Eitherway, are your speeds over WiFi or wired? Try if you are getting better speeds when connected over wired ethernet.
Check if you are getting good speeds at night. Try these links
As others posted BSNL Kerala (possibly other areas as well) is in a bad state right now. During the day the speeds are pathetic. Local endpoints like the one you tested against would show relatively higher speeds, but file downloads may be slow.