The public schools in Nicaragua are

less than desirable. They don’t teach a second language and they’re graduating students with an 8
th to 10
th grade education.
The middle and upper class Nicaraguans and expats send their children to private schools in Nicaragua, which are excellent and accredited in the United States. There are a dozen private schools in Managua. Every year these schools publicize how many of their students were accepted to top rated colleges in the US and elsewhere and it’s always interesting to see. Out of a class of 80 – 100 students, 25 or 30 of them get accepted to first and second tier colleges in the United States. Some of them go to Spain, some go to Mexico, some go to Chile, but the largest group of the graduates from these schools goes to the top rated colleges in the US, including Harvard, Yale, LSU, UCLA, etc.
Most of the private schools in Nicaragua bring in teachers from the States. As a result, the middle class and wealthy Nicaraguans who are sending their children to the private schools have their children being taught by North American, English-speaking teachers, so the students learn English from a native English speaker. All the subjects are taught in English and Spanish. I have spoken in English with younger Nicaraguans as well as older Nicaraguans who graduated from one of these private schools 25 – 30 years ago, and they speak English without an accent.
In Granada, Nicaragua, where I live, there are two bi-lingual schools, both fully accredited. One is Sacuanjoche International School, which was opened by my wife, Janice and I, which goes through fifth grade. (We have plans to continue adding a grade every year.) The other school is Mount Berkeley, which has grades kindergarten though high school. At Mount Berkeley, their teachers are not international; they’re Nicaraguans who teach English.
I don’t know if they have a private bi-lingual elementary or high schools in Leon. They do, however, have a well-known and well-regarded college.
I doubt if there are any private bi-lingual high schools in the San Juan del Sur / Tolla / Rivas area.
The cost for private grade schools in Nicaragua is about US $200 to $250 per month.
The cost for private high schools in Nicaragua is more like $5,000 to $7,000 per year.