SAT essentials?

What are the essential things i need to learn about maths , reading and essay writting that appear always on SAT?Also how can i concentrate better whe

What are the essential things i need to learn about maths , reading and essay writting that appear always on SAT?
Also how can i concentrate better when i have a reading session in order to select the right answers?

or:What are the essential things i need to learn about maths , reading and essay writting that appear always on SAT?Also how can i concentrate better when i have a reading session in order to select the right answers?

or:It depends.

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