A member called ACS seeking advice/a recommendation for an online course that he can share with his students to help them to 'brush up' on essential math skills in order to be better prepared for chemistry. If you have any suggestions please post here. Thank you in advance.
I highly recommend ALEKS for mathematics. It's widely used in HS and college and has lots of evidence to support its efficacy.
After consulting with a math colleague, Khan Academy (specifically the Algebra 2 sequence) was suggested.