Hi !
In my Highers last year I got all A's, what subjects are you doing this year??
I can sympathise with feeling alone when everyone else seems to know what they're doing, I think I've actually failed more prelims than I've passed lol 😭. It's not impossible to get 5 A's though, no matter where you are grade wise rn !!
The main things that I'd recommend would be like BBC Bitesize,
-the understanding standards website (ran by sqa, gives examples of answered past papers and the the markers commentary, v good for giving you an idea on what to do in the exam ^^)
-things like quizlet can be good but I think there's a paywall now? not sure.
-I'd recommend Memrise for if you're doing any languages,
-and if you type "SQA Higher + (your subject)" into youtube, there might be some lectures from during lockdown that teachers left up on youtube which can be helpful.
-Also the course specification bit on the SQA website for each subject can be good in getting an overall grasp of what's needed revision wise.
-Doing timed past papers, and then marking them using the SQA's marking scheme can help give you an idea on where to focus your studying for each subject and can help you feel more prepared for the final exam 🙂
-If you know anyone in S6, you could try and ask for their old notes/jotters?
-For essay subjects like Higher Modern Studies or RMPS (if you are taking either), try and do one 20 mark essay per week, it sounds a lot, but I completely flunked my RMPS prelims in S5, my teacher made me write one essay per week on top of studying, and ended up getting an A.
-Also looking up "SQA Higher (+Subject name) checklist" could give you an idea on the topics needed for the exam.
-Bit of a stereotypical answers but flashcards can be really helpful
Hope this helps a bit! Sorry for the messy format of my answer lol