|"Ain't nobody chasin' nobody nowhere."|
Pronoun case questions test you on whether you know the difference between "I" and "me", "he" and "him," "we" and "us," etc. Here's a quick sentence structure to help you organize these:
I chased the dog around the house.
The dog chased me around the house.
He chased the dog around the house.
The dog chased him around the house.
We chased the dog around the house.
The dog chased us around the house.
...and so on. This simple setup is a great way to remind yourself which pronouns are subjective case pronouns, and which are objective case pronouns. If your pronoun is chasing the dog, it's the subject, and is in the subjective case. If the dog is chasing it, the pronoun is the object, and is in the objective case.
Here's a complete list of the pronouns between which you'll need to differentiate on the SAT. Read through this list thinking of the dog chasing sentence in your head.