Hello,
I was wondering how would you study for a Research task with in-class component in Y12
Thanks 
Hi! Welcome to ATAR notes
So I'm assuming your for your research task, they would've given you a bunch of questions to answer or topic to research with regards to a subject you're studying now.
I would start by
looking at the syllabus and seeing what syllabus dot points correspond to the questions given. For example, if your questions had to do with vaccines and a disease like Smallpox you'd probably be looking at syllabus dotpoints to do with: B cels and T cells, antibiotic resistance, pathogens, vaccination and public health programs etc.
By doing this, you're essentially gauging what you're supposed to know for the HSC with regards to this topic and you'll be able to find information on those specific dotpoints via your textbook, sites like ATAR notes,
https://dc.edu.au/hsc-biology-maintaining-a-balance/ is another place you can get some info. You're also narrowing your search and getting a clear idea of what else you should be researching as you start to move away from HSC aimed content towards official government and health sites.
Simply
creating notes for each question will do and from then on, use whatever
revising techniques you'd use in a normal exam situation.
Imo, the best way to revise is to actually
teach the content you've learnt. Teach to your siblings, your parents, your dog or even the wall is fine (often though an actual person may be better as they can ask questions). Use the research you've collated as 'prompters' and explain it as clearly and succinctly as possible. This is good for revision but it also helps to measure how well you understand a topic (you can measure how often you need to refer to your notes for example or just simply how well you can explain something) and it is a very efficient way to make content stick.
Work together with your friends as well. My friends and I would put our research side by side and see if there's any important and relevant information one person has that the other doesn't. This is a nice quick way to broaden the detail in your research as well. Also, (going back to teaching) get you and your friends to teach each other. They'd be more knowledgable about what you're learning than your siblings/parents.
Hope this is helpful! Good luck with your assessment

feel free to ask anymore questions