Check this out for study scores needed
https://vce.atarcalc.com/?no_mobile=1In terms of actual marks your SAC marks do not matter. All that matters is your rank in your cohort and your exam mark.
The marks you need to get a particular rank will vary greatly depending on your cohort/difficulty of SAC/how harsh your teacher is marking/etc.
I put raw 34 in for all of your subjects (with HHD) into the calculator and it came up as 85.4
34 for all your subjects is absolutely achievable. I would plan to stay in the top 10 if your cohort is large or the top 5 if your cohort is small and you will have no problem

If you want to find out your rank try either asking your teacher or if they won't tell you ask your friends what mark they got for a comparison. Your teacher may also give you highest mark/average mark.
EDIT: Didn't read the first part of the question. My top tips are:
1. Don't put off your homework. You already know you shouldn't but you will probably do it at some point anyway. Try and avoid it as much as possible.
2. Don't just do the assigned homework. Read the next chapter of your textbook, make notes on it, etc.
3. An extra hour of sleep the night before your SAC will help you more than an extra hour of revising (note: this doesn't apply if you're
learning the content because you've been procrastinating too much, learning>sleep>revising)
4. Ask questions! I'm sure you'e heard this a thousand times before but it is so true. Ask your teacher or ask us
