You should definitely look at the websites linked from previous replies because they provide a lot of statistical information such as performance of both students and teachers.
Visit and/or call any school you're considering; I'm sure there are staff available to give you any information you may need to make an informed decision and to better answer your questions. Good luck!
Rey Hollingsworth Falu
Licensed Associate Real Estate Broker
Houlihan Lawrence - Bronxville
However there are many websites in the "Great Out There" that can give you insight. Just google Yonkers schools, and you will get all the answers you need.
Realtors are not allowed to provide opinions on school districts or neighborhoods.
Do consider going to websites such as SchoolReports.com or my website, http://GladstoneGroupRealty.com, which has links to school reports, and do your searches there.