Unfortunately, there is no way to search the library collection and limit just to the UBC Okanagan Library curriculum collection. If you are in person and want to browse the collection you can do so on the second floor of the Library in the South-East corner, or the section on the other side of the staircase to the second floor.
To search for children's books through the library website, you can search for the keyword and the phrase "juvenile literature". For example, if you are looking for items related to math, the following search can be put into the Books & Media tab on the library homepage:
"juvenile literature" AND math
You can then limit the results by location to Location: Okanagan Library. You will see if a result is in the curriculum collection by the "Status, Library Location" to be "available, Okanagan Library curriculum" under each title.