My DS was like this. Things came to a head in the Feb of Y11 revising for his mocks. He was predicted AAAABBBCC. His school had identified him (and other boys) as 'bright but lazy' and were doing their best.
I nagged, persuaded, reasoned on repeat, til, one day I just sad 'YOU know what you should be doing, I can't help you if you won't be helped, this is destroying our relationship so I'm going to stop now. I will help if you ask and may well lose my temper with you again'.
And left him to it.
He got AABBBBCCC. He went to a forgiving 6th form to do Maths, Physics, Economics and Geog AS, lying to them that he wanted to do engineering ('Well, it shut them up, didn't it?').
Needless to say this rapidly fell apart, but he had a bit of a shock when at Parents Eve, before Xmas, his teachers basically but fairly told him it was no skin off their nose if he failed. Suddenly there was no Rara squad, no bribery, cajoling, begging. Just 'up to you, son 🤷♀️'.
So I told him I wasn't going to finance his failure, 2 low grade A levels weren't worth the paper they were written on, as Maths turned into Use of Maths, and Physics disappeared off his timetable.
Then I discovered the Extended BTEC, via a young guy at work who'd taken the same trajectory. DS expressed interest, given that he knew A levels weren't working for him, and vice versa! And the alternative was a job.
There was one offered in Computing 20 miles away so we pushed him through his driving test, but miraculously, last min, our local tech decided to offer it.
DS finished Y12 with an E grade AS in Geog to show for it 🙄 BUT with a year's maturity and the recognition the world didn't owe him a living, on board.
The BTEC suited him well, constant targets, 13 units, 2 years and a class of 8; 3.5 full days a week. He got the UCAS points equivalent of 2 A stars and an A and went to uni with a scholarship, graduating last summer with a first in software engineering, now in his first year of a £30k pa job.
Maturity and a bit of a rude awakening. And he never has to read another poem....