get to it now so you can call first thing tomorrow morning. Then you’ll have a bit over three months to cover two years’ worth of specialized content (hopefully 2/3 of it will be review).
1° will your parents support the idea (of big essay tests)? Will they help if you have to drive far?
2° what are you doing during your “gap year”?
3° are your parents ok with your going to college?
4° have they got money saved for you? do they have a budget, geographical parameters…?