In my opinion job work services provided to government will be exempt.
As per entry no. 3 and 3A of the exemption notification, any pure services or composite services provided to Government by way of any activity in relation to function under Article 243G/243W of the Constitution will be exempt supply. As per the Article 243G/243W, functions include the matters as per the 11th/12th schedule. 'Education, including primary and secondary schools' is a matter in the 11th and 12th schedule.
Since, the job work is service to government in relation to Education(printing of school books), it comes within the ambit of exempt supply.