The College Board partnered with the Khan Academy to develop an entire suite of online SAT prep materials, which you can access for free.
If you would like a more customized route for higher points or a more optimized study path, then there are many companies, including Powerful Prep, which offer this service.
Get Prepared To Apply To College In The United States
If your path is to gain acceptance to an elite university in the United States, I highly recommend reading our guide: How To Get Into The Ivy League as an International Student.
In the article, you will learn how build a timeline leading up to applying that will maximize your chances of admission.