Hello
I have finished FA along with UW for step 1 and I have about a month left. I was wondering what other additional sources would you suggest me to use during the last month to help to understand the concepts better.

Thank you

Hello,

I think taking one of the NBMEs or UWSA now is a good option. you can see how you fare and then give importance to topics in which you couldn't perform well.
Revision of FA and UW(along with notes you made) should be a good thing to do now, instead of eyeing newer sources.
just an opinion.
all the best!