SAT + SAT II Test Preparation?

Hi and welcome to my blog,
I opened this blog to help anyone who is preparing for his SAT.
I remember myself when I started - I was so lost and in such a panic.
Luckily I got this great SAT guide that helped me a lot . So study hard and good luck!
I am going to take the SAT test soon.
To prepare for it, I’m thinking to buy the "The Official SAT Study Guide (TM)" and enroll in its online course, "The Official SAT Online Course™" (both by Collegeboard)..
I’m just wondering – has anyone tried the book and is it a good prep book? Also, anyone tried the online course? Does the online course prepare you well for the test? Is it worth its price?
Or do I have to take like real Saturday classes in order to do well on SAT?
For SAT II subject test, I’m planning to take Math, but I have no idea whether to take Math I or Math II. Is Math II a lot harder than Math I? What’s a good book to prepare me for either?
I might also take Chemistry. Is SAT II for Chemistry hard? Any book recommendation?
Only serious inputs please.
Thank you and good day.
Anything offered by the College Board is excellent. You will not go wrong their.
Helpful math and chemistry study guides are below./
On preparing-
I found the book to be a little too easy compared to the actual test, so I highly suggest using the Barrons SAT prep book. However, it depends on which book you feel more comfortable with because no book has that special "more points" ability. I would suggest just reading the book as courses usually just have a person who babysits you while you use the book. In some cases that really helps for people who know they won’t really use the book, but if you are determined enough then it’s unnecessary.
Subject test-
Math II covers subjects that are more advanced, but it also depends which you are more comfortable with. The main difference is that many colleges don’t accept the Math 1 test, but that all depends on the colleges you are applying to. I know Math 1 is mostly algebra and geometry (the questions are not easy, but if you know the material it may seem like that) and Math2c is mostly geometry, more difficult algebra, and trig. I remember taking practice exams for Barrons on Math2 and received a 680, 720, and finally a 740. On the actual test I got a 800, so in that case Barrons helped me.
SAT2 Chem might be hard or might be easy, it depends on your prior knowledge on the subject. The SAT2′s are designed for students to demonstrate their aptitude in areas they EXCEL in, so pick the subjects you do the best in.