From day 1 of secondary I never asked how was their day, I asked what they did in each lesson so they came home and whilst eating their snack gave me short answers like History, French Revolution, Maths, algebra etc. This led to conversations and potentially wider "reading" (youtube) on the matter. School were also very hands on. Parents in before year 7 setting out expectations as parental involvement which can massively improve grades and the school was rated outstanding with an incredible Progress 8 across all abilities including low ability students.
School also provided all the CGP revision guides, used them in class in conjunction with work, especially English Literature Poems which shows the breakdown of all of them and pointed out the high scoring level 6 responses of both form and structure.
School invited parents in again for revision evenings, laid out Assessment Objectives (AOs) for subjects like English and History, provided WAGOLLs (what a good one looks like) to the children which were stuck into their books and colour coded with the AOs so it was obvious in the paragraph which part was AO2 or whatever. Basically school did everything, and I mean everything they could to help a child pass their exams.
What I did as a parent, helped my child work out what revision works for them, flashcards, mind maps, brain dumps etc. Summer of year 9 read all the books for English and the poems. Watched the plays/films of the English books they were studying so they could understand the setting ie A Christmas Carol, watching other films set around the same time with all the introductions, bowing and curtsying. Read MN a few years ahead so I wasn't taken by surprise by something and knew what was recommended for revision help.
For year 10 the most important thing for your child to take note of is any test they did in class and end of year tests. Look back over it. Get them to understand they start with 0 marks and gain marks. How you gain marks is the most important part. For any book they have studied for English literature in year 10 looked at a past paper for that book and the mark scheme to see what the exam board is looking for.
Provided snacks, drinks, support, a place they could complain. I also explained the exam grade curve, what that looks like for grade boundaries across the years and how tight some of them are. We also looked ahead together, so if you get mostly grade 5s can you take A levels? What grades does that translate to at A level? What grades do you need for university or apprenticeships? What jobs and apprenticeships are actually out there?
I had no parental involvement at all in any school work I did and I always thought I wasn't very smart, I did go to uni by the skin of my teeth. I think how much better I would have done if I had even had a desk to work at rather than doing homework on my lap on my bed. So I did go to the other extreme. Both my children went to uni with incredibly high grades from GCSE on.