Even though you subscribe the 384kbps or 3.6Mbps Celcom 3G broadband package, it does not guarantee that you will get the maximum speed.
Speedtest is a website that allows you to check your broadband speed. When you visit Speedtest website, it will locate your location based on your IP address. Then it will display servers that near to you. The recommended server is mark with yellow. You can choose the recommended server or you can choose other server to start the test.
It will start with the download test first and then it runs the upload test. After both tests are completed, Speedtest will display the result in .gif image which you can use to share on your website or in forum.