4 Cs does not look good but all As with a 90th SSAT would show you have potential. You would need to craft some reasoning in your essays or interview about what caused you to turn your academics around. It could be a good story if you have one. Are you looking to play football at prep school? Have you contacted coaches? What was 6th grade like for scores? We’d need more of your resume/background to give you a fair response. Consider your question incomplete at the moment.