DS2 is 10. He has the most atrociously messy handwriting. Have decided it's my our mission to improve this over the summer - any ideas for how to do this please? Some letters I can identify as needing work (eg his 't' is too short, 'f' doesn't drop below the line). Other than working on specific letters, does he just need to practise? Has anybody had any success with kids this age? His year 5 teacher said 'it's a bit late to change it now, really' 
Thanks.