What should be the elements in the set

Do I need to write the letter 't' twice inside the venn diagram? What should be the answer for n(A)n(A)?

pay attention in your classes and concentrate the best thing you can do to raise your test scores is to pay attention when you're supposed to be learning the material: in class!

take good notes.

do your homework.

use mnemonics and other tricks.

do practice tests.

note: the best i know.