Hey Victoria, algebra two should be enough to get you through the questions on both the SAT and ACT. There may be one or two questions regarding trigonometry concepts, but even these seem to be covered in most algebra two classes these days.
To know whether or not you're prepared, take a look at the link below. The College Board provides eight free real practice tests. Check out the math section, or better yet, complete a math section and score it with their provided answer key.
Best of luck!