Forgot category

What if I forgat what category I submitted to? Any way to track that down so I can submit status request?

Sorry, that is impossible to do.
You could either
- make an educated guess about the category and ask for status
- just wait until the site is reviewed
- suggest the site a second time, as you are asked to go for the best one category this should be the same as your first suggestion, don't forget the category this time, and ask for status after 1 month (suggesting a site a second time won't bring you into problems)

As an addition to this excellent advice I would suggest a combination of the first and third...

Find the category that would best fit the site.
Ask in the Submission Status forum on here whether it has already been submitted.
If not, then make a new submission to that category.