I test my internet speed with BSNL speed test(speedtester.bsnl.co.in/) and speedtest.net.
I am using BSN WiMax. The speed is very low. Even a speed test by avast mobile security in mobile also shows red colour and says download speed is very low. The promised speed is 1Mbps.
As my net use is very much limited and mostly ISC, email and some news reading, I am somehow managing with that.
Mostly we see that the promised speed does not happen after some time. The providers use 'throttling' to restrict the download speeds as they go on adding more and more users. In the case of 'unlimited' category this throttling is sure to happen. Speeds become slow on certain time slots when there are many users. The speed will be sen becoming slow when the starting of business timings, ,during peak business timings etc..
What little we can do from our side is to keep our device less congested by cleaning RAM, by opening only one window/site in browser at a time, restricting or disabling heavy videos etc if not essential, using faster browsers and keeping browsers, OS and antivirus software updated always. We should also restrict background activity of applications and software. We can also keep regular scans to prevent malware and virus. These can give some cosmetic effect.
The problem of speed may be brought to the service provider, who may either rectify the issue or suggest migration to another suitable plan.