Rockledge is nice and close to some of the mansions in Yonkers. I've heard of people benefiting from the Bronxville PO on sales tax and insurance because it looked up the zip code and not the actual municipality.
The good thing about Yonkers schools is you can choose where to send your child. It's not necessarily the neighborhood school or one closest to you. Check
www.yonkerspublicschools.org for more info. And with Microsoft investing in the district and the recent addition of college preparatory programs, you can truly find some high achieving and challenging schools in Yonkers. Try and get a report on each school specifically rather than the district as a whole and you will have a clearer picture of the education in Yonkers.
I have friends who graduated from Yonkers schools and attended Harvard, Yale, MIT, Cornell.