Depending in the size, try binder dividers! You can get them in any color at most retail stores that seel school supplies!

(Amazon listing for reference)

AmazonBasics Two Pocket Plastic Dividers with 5 Tabs, Multicolor, Pack of 3 Sets https://www.amazon.com/dp/B07K92HF9K/ref=cm_sw_r_cp_apa_i_00qGDbECC3HYS