**Caution - there are lots of practice test sites on the internet. They will appear to be from the DMV. Most are private sites and not associated with the official NCDOT/DMV. Make sure they are using the most current version of the handbook (2018.). Also pay attention because some sites will make you pay. There are plenty of free ones available.
There are 10 Practice tests on this site - all are linked across the top of the page. Passing score is 80%.
Sign Test passing score is 9 out of 12 signs correctly identified.
NC Driving School Practice Tests- this is a credible site. A lot of school districts contract out their driver's ed courses and training through them.