What is the best UI component to make user select a number from small range (1-12)?

I'm creating an Android application in which I want user to select a number from 1 to 12 (The standard in which user is studying). For this I've considered a dropdown with numbers 1 to 12 or a seekbar with range 1 to 12, but I think it'll not be good user experience to provide just 1,2,3.. numbers in dropdown or in seekbar.

What is the recommended component to use in such cases?