Once someone submits their form, is there the option for them to go back and review what they've submitted?

Yes, you can do this. You can send an autoresponder with a edit link. So, your users will able to use this link and edit their submissions.

You will be able to add this edit link to your e-mail templates. Here is the guide:

https://eu.jotform.com/help/40-How-to-Let-Users-Update-Their-Form-Submissions-at-a-Later-Date

You can also send the autoresponder e-mail at a later date. This is the walkthrough:

https://eu.jotform.com/help/535-Utilizing-the-Send-Emails-Later-Function-of-the-Autoresponder-Emails