For every day of school missed it takes 3 days to make up what was taught.
Only 3% of students who miss more than 50% of school achieve 5 good passes at GCSE.
80% attendance is the same as having a day off every week, throughout KS3 and KS4 this adds up to a whole year of education lost.
By aiming for 100% attendance you give yourself the best possible chance of achieving your targeted grades.
Please read an important letter here about the legal implications if you allow your child time off school.