Colegio Concertado (Valencia)

Hi everyone. We are moving to Valencia over the summer. My son is 12 and we are looking into schools. I am looking into getting him into a nice Concertado as he speaks Spanish perfectly, however he was never schooled in Spanish, only English. Long story short, he was born in Venezuela, moved to the USA at age 5 and holds a Spanish citizenship because my Dad was Spanish and was forced to emigrate during Franco's time to Venezuela. So, he is fluent in both languages. We plan to live downtown Valencia (Ensanche, Canovas, Mercado Colon, Ruzafa) or around, depending on schools. Any recommendations? We greatly appreciate it.