As said, three books are more than sufficient. Don't fret over the SSATs too much, I mean, really. Better get started on writing essays that blow minds and getting recs that impress.
Also, just a side note, start spending more time with your current friends and family now. Once you get admitted and August approaches, you'll be feeling like the saddest person in the world. And excited too, of course, but that's another story.