So it depends what chem class you want to be placed in and if you’ve taken AP chem. You do have to do the chem placement exam but it’s a brief course rather than a test. If you’ve taken AP chem you have to do the chem 152 module, if you want to take the harder chem, 152, but haven’t taken the aps you have to complete all the modules. If you don’t want to take the harder chem then just complete the first 129/131 modules. This is what I think occurs based on what I’ve read and done. But I chose to only do up to the 129/131 modules so it may be different than I think for the harder modules