Unfortunately I had a similar situation years ago, he’s now off everything. As he is on the birth certificate he will have his rights & responsibilities. My ex did remove the kids from school, police where involved as he was deemed dangerous so there was a man hunt for my kids, I got them back after a stand off with police. Try speak to a solicitor, the school can send school reports etc out to him if he requests these. The police had a big hoohaa with Glasgow city council over this, it was a mess but once sorted it will give you peace of mind x