Hi! I was wondering, is it possible to do really well and get a 99+ even with an abysmal early 3/4 study score. Theoretically, how can you do well with five 3/4 subjects if you can't do well with one? Especially if you regarded the subject as more than a subject and as a passion?
Is it possible to get a good ATAR despite low Unit 3/4 study scores? Absolutely.
I know people (friends + my past students) who have gotten (all real examples and many others):
1. ~35 raw in their Year 11 subject and an end ATAR of 99.75
2. ~25 raw in their Year 11 subject and an end ATAR of 99.20
3. ~45 raw in one, ~35 in the other and an end ATAR of 99.50
How can you do well in 5 if you can't even do well in 1 subject? First step is believing in yourself! If you think you're going to fail, you are more likely than not to fail.
Second is realising that your 1st subject is usually subject to high variance. It's your first exam, in a COVID-19 year that's probably once-in-a-lifetime and so this is rarely indicative of what your Year 12 will look like.
Three is a critical need to identify what went wrong (so truly understanding what areas you need to fix) and then backsolving to get to what you need to do to improve - and this often requires really really focused and honest reflection to actually get to the crux of the issue.
Hope this helps!

and also you may have not done as poorly as you think you did in the first place