Since this is a thread about proper English; I've grammar, punctuation and spelling Nazi'ed your post.
Note: I'm unsure if you're telling them to buy a book off a kid, or books made for kids.
That's fair enough
Additional advice: make sure you're not too tired when you test yourself, or you'll make a poor display of whatever you are
supposed to know already...
I meant both, actually (and somehow my brain t
hought it was a great idea to garble both sentences in
to a single one):
- buy some used textbooks from kids at the end of the term (checking your own level with actual kids might be a good idea to know which grade we're talking. Pick one of your friends' kid, not a random one in the street xD)
- buy exercises books (workbooks?) meant for kids. Repetition makes perfect. Just my 2 cents, but absolutely avoid using a computer/phone: pen & paper is where it's at.