Hello,

I must inform you that exams like Sat,Ielts,etc test your English skill mainly.

For Sat there is mathematics section also,so you have to prepare accordingly.

I would suggest you to buy the official books which includes previous years paper,model paper,practice questions,etc.

You can get more information regarding these in sat website and other official website.

You must practice lot of questions and test yourself as much as possible in the given time .

Further you can refer to khan academy for more deatails and practice.

All the Best