Your other option is to take the ACT. The ACT is four-part multiple choice test, comprised of English, Math, Reading, and Science sections. There is also an optional writing section that most colleges prefer or require. The ACT scores each section from 1 (lowest) to 36 (highest) and your overall score is the average of these four (or five with writing) scores. There are also plenty of test-prep books available for the ACT, as well as online resources. Here is the ACT website with more information.
Many people take both the SAT and ACT and see which one they score better on. It varies from person to person which is 'easier.'
Also: If English is your second language, you may take the TOEFL (Test of English as a Foreign Language). For information about this try:toeflgoanywhere.org