Winnie,
Are you saying that the Israeli government asserts no control over the curriculum of Chareidi schools, despite providing the schools with funding, and that the government does not set any minimum secular subjects (i.e. math, science, foreign language, etc.) that must be taught in Chareidi Yeshivos/BYs?
Once they assert any minimums (science, math) it is easy for the Israeli Department of Education (or whether they’re called) to modify the required curriculum to include things like evolution, teaching respect for different lifestyles, minimum number of hours for secular studies, English, etc.