Having the prepositions of time listed and in sections is nice. But I would also have more graphic examples. I would make a worksheet where the students matched examples to the appropriate preposition of time.
Choosing among the words "during," "while," and "for" can sometimes be confusing. Check out this American English at State graphic to learn how to correctly use each of these three words. What other pair or set of words are sometimes confusing to you?
A preposition aid for ELL students as well as native language students. Comprehensible input is critical for ELL students, and this guide provides engaging pictures that explain the most common prepositions in the English language.