I am suppose to, There are some teachers who don't care about it, So around them I leave it untucked. I Fake tuck it in when I go into a assembly, Then When I sit down I un-tuke it.
If teachers say something about it, I fake do it while they are there, Then I put it back to normal when they walk off. Since year 7 I have never tucked it in, It feels very annoying. Now I am in year 11, No one really seems to care about it, Unless I am going in for a GCSE exam, Like today, Then I have to. Even the head don't care about it, Some teachers do, But Mhhh with them XD