In the cosmetology school I transferred from, the curriculum was similar. Curly hair is not the priority. So, you will often need to learn how to deal with curly hair care outside of a typical school.
I have been teaching fellow students how to care for Locs. When clients come in to have their hair retwisted it becomes a teaching opportunity. It's good to see that a few of the students are learning to care for our locked hair. They teach me how to put sugar on a burning scalp while the relaxer is straightening the hair, and I teach them how to twist Locs. (Smile)
If you want to get a license to do braids and Locs you may want to focus on just a braider's license rather than a full cosmetology license, unless you also want to do chemical processes, skin care and nails. Getting a cosmetology license may not give you more curly hair education than a braider's license.
Whatever you may decide to do, just know what you're getting. Ask about the specific curriculum. And, go for it! Keep us posted on your education. Please share your personal experience from your various states/countries.