Well, I usually go ahead and buy any helps I can get with mathematics, so I do recommend getting the instructor's guide. You do not have to buy the test booklet, but they do have one. A workbook is available, but we never bought it.
Kareni had a good idea...gotta keep up those Alg. II skills for further study and those wonderful standardized tests!
BTW, I only popped in on the boards this past week, just like you. Great minds think alike? Or is it desperate homeschool moms always find each other!:D
Yvonne in AL