How to bypass bandwidth limitation

Pls if anyone could assist me. Looks like my school has placed a bandwidth limitation on its WIFI, so after some number of downloads, the speed terribly reduces from 4MB to 300KB. So I was wondering if there is a way to bypass the limitation. I have tried VPNs, it didn't work. Any help will be appreciated. Thanks.

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Thanks so much. Will try and give a feedback.