I don’t have any school aged kids any more nor do I know anyone who lives in Managua. I can’t be of any real help. I have seen schools advertise on the international teaching sites. You might go into the forums and ask around. I think your relatives with school aged kids or their friends would be the best source of information. Keep in mind that many schools have a different calendar year here. Summer vacation starts around the end of November and runs into February at many schools. Some run September to June, make sure to check it out. Good luck.