Here are some exercises for reviewing some of the English sounds that learners have trouble with.
QuickAndDirtyTips.com
Alexa Polidoro
Dictionary.com
VOA Learning English
LinguaBoost
LaunchPod Media
Splendid Speaking
Radio Lingua Network
Paul Collins and Rob MacLachlan - IELTS Experts
don't worry if you don't have an account with us, we'll create one