The Israeli education system faces challenges in integrating large influxes of immigrants from over 70 countries since 1948. It has developed special programs to teach Hebrew, Jewish history and train teachers for immigrant students. The government funds most schools, with higher expenditures on education than most OECD countries. The system includes state schools (majority), state-religious schools, Arab schools, independent religious schools and private schools. Enrollment has greatly increased since the 1950s. Higher education plays a key role in Israel's development, with over half of youth attending university. However, Arab students face resource gaps compared to Jewish students.