I sat almost the same subjects /swap out Chemistry for History/ and achieved 5 As last year in them.
In order to get an A in English I'd drop the possessive apostrophe when you're pluralising things. (jks - pet peeve of mine)
Seriously, though - as banal as it sounds - just, like, study?...
I think one of the issues most people face at school is being too willing to try hard enough to get by, if you strive to just get by then that's all that'll happen lol
I'll state what I did for each of my subjects, but each person learns and revises differently - hopefully I'll be of some help haha
For Mods I rewrote the 20 essays out over and over until I knew them off by heart (gradually condensing the info after each round - until I was able to formulate entire paragraphs just by remembering a few instigator words) - I'm aware it has changed and now source questions are in the exam, however I'd prescribe to a similar method of rewriting rewriting and rewriting ~ I know I revise well this way, if you hate this style of revision then obvs don't do it hah (I did the same to get my A in History, but with more brightly coloured spider diagrams as History was at the start of exam season; before I lost my faith in highlighters and the superficial - my notes may be ugly but guess who got five As super judgemental anally retentive stationery-philic friend? - hint, c'est moi - also insert some moral about looks not mattering etc etc)
For English I just wrote a banging folio (28/30) and then exam-wise I had enough peripheral knowledge of my SST and a practice essay I had done just a week before the exam came up so it was a bit of luck I suppose but also hard work and revision etc etc haha ~ close reading was just a monotonous drag imo, it's really formulaic so just follow your teacher's instructions and you should ace that part no problem
Maths was a cluster f*ck of awful - my revision consisted of me trying past papers, getting to a question I couldn't do, getting annoyed, tossing the past paper book across the room and reading Mrs Dalloway or smthn instead haha - I really hated maths, and I couldn't have told you whether I was gonna get a D or an A ~ luckily it happened to be the latter
I had the privilege of being taught by a Biology teacher who literally writes how to pass books etc and also is on the SQA exam board for Higher Biology so yeah - thanks to him, and many many many past papers I got my A (I eventually just started copying out the answers from the answer schemes tbh - since I found problem solving mostly just common sense, and it was the KU I felt I needed to really get a hang on)
I didn't sit Chem but had friends crying over it lol so yeah good luck with that! (two got As and one got a B in the end so I wouldn't worry haha)
My friend got three offers from medicine this year with AAAAB at Higher - and was accepted into her course despite missing her uni grades at AH (needed BBB, got BCC) ~ so yeah, it's scary but medical school isn't solely for the infallible straight A students so don't freak out if you ever get a B haha