The Israeli military permitted high schools for 36,000 students to reopen in the occupied West Bank and freed more than 100 teen-agers from jail so they could attend classes. Military officials said the reopening of schools, closed since February, signals a return to normal life in the West Bank and Gaza Strip and a waning of the Palestinian uprising. But students vowed to hold anti-occupation protests after classes, and there were reports of scattered unrest at high schools. Grade schools and junior high schools reopened over the past two weeks. West Bank universities, traditionally centers of anti-Israel activism, remain closed.