As others have posted, there are other methods.
Fining for truancy is stupid anyway.
There seems to be a presupposition by many on this thread that forcing students to go to government schools is a positive good, and the only topic of discussion is what means shall be used to compel parents to comply. I disagree with the fundamental premise. If anyone can show me the place in the Constitution that mandates public school education and attendance for all, I would be fascinated.
This country managed to grow and prosper for centuries before all children were forced by law to attend a school. I do not agree that the public schools are doing such a good job of preparing kids for adult life that everyone must be forced to attend on threat of death.