SAT questions???

<p>hi guys! I'm new. And it's nice to be here.
I have studied SAT for several months and I'm having so many problems.
First about the essay
+ How many examples do I need at least to get a high score?
+ What if I don't understand the prompt?
Second about the CR
+ I don't know why sometimes I feel like I understand the passage but in the end I answered half of the questions incorrectly?
Thanks in advance.
Have a nice day:))</p>