Hello,

From what I understand , you are trying to apply to colleges abroad for PG programs. PG programs abroad require the GRE exam or the GMAT( for management or MBA courses), and TOFL. You won't be required to give the SATs since it is only for UG courses.

The kind of preparation you should do is totally up to you and depends from individual to individual. So decide accordingly.

Every university has their own cut off and the students are required to achieve scores higher than the set score. A higher score means a higher chance of getting into a good college.

Hope this helps!