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Rabbi Gluck in Monsey. Hes the one referred to in the post above. His place may be just what you need.
Also try asking advice from Rabbi Binyomin Strauss in Lakewood 732 674 0967. He meets with parents and child,no fee. He gives a recommendation where you would have a good fit. He often has connection to the school that can help you get in. I think he is funded by a donor to help boys get into high schools. Unlike Rabbi Gluck, he doesnt have his own school or educational setting.