I have a doctorate and it is hard not to say things like “I did my homework “ if you always did. My kids had various levels of motivation at your DS’s age. At one level you cannot make them do what you did but you can agree “scaffolding” to help them be better prepared.
We’ve used the following as positively as we could:
Talking about how they might as well get their GCSEs while they are at school because they are there anyway
The more and better the GCSEs the more choices they will have later (work, college, apprenticeships etc.)
Turning over a space (dining table in our case) to a study space with post its on wall with topics on and once there were cards or a mind map done of that topic, it got moved to done section
Watching YouTube videos together for science, watching films of books and plays for English lit
Instituting a “power hour” - one hour of study an evening when I was cooking so that we all got to relax a bit in the evenings
Buying revision guides and printing past papers
Buying revision cards, A3 paper, nice pens, highlighters and helping them work out what suits them best
Teaching how to use tricks like mnemonics in exams. My kids always say, “Isn’t that cheating?”
He’s young. He may take a different path to you. I have a well paid, interesting job but my husband who left school at 16 earns a bit more than me. Most of his family are in business and most of mine took a degree then profession route.
Anyway good luck. My suggestion is relentless, upbeat positivity and encouragement while scaffolding. Keeping a good relationship is central to everyone’s wellbeing. There is usually a gcse support thread on here. Sometimes there are lots of parents with already academic children but often there is a mix and a lot of support (for you!)
One of my very reluctant GCSEers is now on course for a first in a STEM degree. I would not have predicted that at the time. I have another who started working at 18, has just bought their first car and is thinking about a future that may or may not involve university. All good.
Sorry for long post. I really get it! I do occasionally mutter, “There’s no substitute for slog.”
I think Nick Faldo said that golf was about luck but the harder he worked, the luckier he was”. 