Applications will be accepted year around if there are openings. Call the schools to schedule a tour. You can expect an interview when you visit. Sign up for admission testing. Most schools accept the SSAT or ISEE tests offered nationwide.
Some schools require their own admissions test.
School Records and Teacher Recommendations will need to be submitted. Your current school will need you to authorize them to send the records directly to the schools to which you are applying. Financial aid applications should be completed between January and March. Many schools notify applicants at the same time in early March. Some schools will notify you as soon as you complete the process.