wireless is so slow.. help me...

Hello there, I'm new of Mac user. I bought Macbook Pro 2days ago.

Before when I used another laptop, wireless speed was fine. When I download something, speed was 400kb...

but now, super slow...

I checked wireless internet speed on Speedtest.net. Download speed: 9.40 mbps Upload spedd: 0.70mbps

BUT when I download something, speed is under 70kb... What's wrong with my Macbook?

somebody help me please...