DS is in year 8 as a music scholar in a selective indie.
He's pretty able - not genius or a super high flyer, but more than capable of getting good and very good marks in all subjects.
Since September, we've left him to his own devices much more, with regards to homework and revision. It's recently become obvious that he is winging it quite often - leaving homework to the last minute, barely doing any revision for tests etc. In most areas, he's getting away with it, getting good marks for homework and doing ok in most tests, but he's not doing well in things like Latin and Spanish tests.
More concerning is that he has now started to lie about his failings, even though he knows we can easily uncover his lies by going into his school online portal. For example, he had a Latin vocab test on Monday which we were aware of, so made sure he revised for it. We asked him how it went, but he replied that he'd got his days mixed up and it was actually the next day; the reality is that it WAS on Monday, he failed it and had to retake it on Tuesday. What he'd actually failed on was very conjugations, which he'd told us he didn't need to know when we'd asked him during revision - the fact that he was able to pass the test with nearly full marks the next day shows that he's just not putting the effort in initially.
We're struggling to know how to address this issue. One of the factors that seems to be at play is that he feels he gets very little free time. His.music commitments and the location of the school mean he's out of the house 11 hours a day, sometimes more. On top of academic demands, he also has to fit in practice on 2 instruments. That said, he's wasting a lot of time trying to avoid doing the things he has to do and generally managing his time poorly. We've said that life would be much easier if he got the chores out of the way before going on the PS4, but he's not buying that because, on the occasions we've made him work first he's faffed around so much that there's little or no time left for anything enjoyable afterwards.
So, what's the best way of tackling this, and is it fairly par for the course with 13 year old boys?