I took Higher: English, Maths, Admin, Art and Psychology and got B,B,B,A,A.
In all honestly, Higher is a huge step up from NAT5, once you've finished it you'll look back and laugh at your past self for struggling. I know I have.
I don't know much about sciences but I can definitely give you tips for English and Maths if you're planning on taking them.
English is pretty much all to do with remembering. The first paper will be on close reading of an unseen text so you'll need to grasp the difference between Outline, Analyse, and Explain and what's included in the Language and Structure categorises.
This website is super helpful for that: https://www.bbc.co.uk/bitesize/guides/zq6vg82/revision/1
The second half of the English paper is more tricky. It's divided into two parts both equal to 45 minutes (if you have extra time it's longer) one part being analysing a Scottish text you have seen before and the second being a critical essay prompt.
Here is where your memorisation skills come into play. In class, you will be shown a variety of texts by one author. At my school, we focused on a poet named Carol Ann Duffy. In the first half of the exam, you will be given four to five questions. The first three-four are the standard 2-4 mark questions based on a text provided and the final question is a total of 10 marks.
The difference between the 10 marker and the others is you will be given a prompt along the lines of "By referring to this poem and at least one other poem, discuss how Duffy uses contrast to explore central concerns." Here you can automatically gain 2 marks by comparing two poems and how they explore central concerns without quoting. After this, you then need to start quoting (quoting and explaining counts for one mark now). I recommend you remember 2-3 quotes of significance for each poem you research. For your six marker to aim for 6 quotes overall.
The essay prompt is much simpler as you are writing an essay. You'll remember things from NAT5 like PEEL (Point, Evidence, Explanation, Link) and you'll also be introduced to TASER when you're writing your introduction (Title, Author, Summary, Essay Question, Response). Here you'll need to take your most significant quotes from your text and try to find an essay question that fits. I recommend trying to get some setting questions in there as they often come up.
Always use Past Papers are they're essential and if you can get your friends to read flashcards to you that's also a bonus.
sparknotes.com is excellent when it comes to critical essays.
Now if you're looking at taking maths I recommend you try Khan Academy, whenever you're doing a topic at school spend 30 minutes of your free time doing their exercises at home. This includes watching some videos and answering about 10 questions. It honestly helps so much and they break the course down into tiny bite-sized chunks so you can understand it better.
- Khan Academy: https://www.khanacademy.org/
I also highly recommend you use past papers but do not use the actual SQA site. Dunblane high school and highermaths.co.uk have so many past papers starting from the 2000's and onwards. Some even have the written working so you're able to follow along whilst you work!
- DHS: https://www.dunblanehighschool.org.uk/maths/course/higher-past-papers/higher/
- HigherMath: https://www.highermathematics.co.uk/
Hope this helps!