• This site has many units, more than we need, and a brief history of how we got these units.  Focus on the ones in the middle, they should look at least slightly familiar.
• This site also has more than we need but another good explanation of how we got these units.
• This site is a good review of the DIMENSIONS of measurement:  mass, length, volume, and time
• This site is Interactive:  check out all of the descriptions  on the right column and the games if you want to.  I am more concerned that you know the order of the prefixes and the standard (basic) units of mass, length, and volume, But we might have to do some conversions this year so the games could be helpful.  And we will need some of the temperature stuff too.  This site also has a lot of good math review, if you need it.
• This site is an almost perfect review of what you need to know