Ok, don't panic now. I think you don't really need to rewrite your notes on the topic you have yet to study in class because you still haven't studies the next topic in class, so you won't know exactly what is unimportant and what is the most important thing, and probably, you will need to refer to additional sources such as HSC online or other textbooks to supplement your current information, it is also advisable you add in appropriate diagrams as well, and that your summary notes includes the first and second hand investigations you have to do, this includes the experiments. Basically you need to:
For notes written on the topic you have studied already:
1)REMEMBER as well as understand all key concepts and ideas-refer to your syllabus-of all the content in senior science you have already studied
2)Make sure you get HSC past papers and complete PRACTICE QUESTIONS UNDER EXAM QUESTIONS on the content you have learnt.
3)Make sure you have organised the information in a method that assist your memory, i.e. use different coloured highlighters, include a lot of appropriate diagrams, a mind map highlighting how the key words of the module linked together-try to make links within the different dot points of the module-the more links you make, the less isolated concepts become and hence the better your understanding and enjoyment of this subject will be.
4)After doing the above, see whether you can shorten your notes even further.
For notes written on the topic you are about to study:
1)Highlight the headings and subheadings in different colour to make the information look easier to read
2)Understand the key concepts and ideas-refer to your syllabus-UNDERSTANDING is much more important than remember anything at this stage-(this applies to the notes you have summarised for next term)
3)Practice the content to be studied next term by doing some questions in textbooks and checking your answer(notice just SOME, not all). Make sure you highlight any concepts you don't understand and any questions you don't know why you got wrong and ask the teacher next term or ask on BOS in the holidays.
Just try your best to complete the next topics for your other subjects-but it is not absolutely necessary, it is much more important you make sure you understand everything you have learnt so far, consolidate your English skills by practising a lot of essay and creative and GETTING SOMEONE TO MARK IT AND GIVE YOUR FEEDBACK. It is much more important to be well prepared for any assessment tasks very early next term rather than try to learn everything at once, and remember to relax-this is so important to re-energise and motivate yourself for the entire year. Remember, HSC is a marathon
Check out my response in this thread
http://community.boredofstudies.org/showthread.php?t=315658&p=6476770#post6476770-this will help you further in how you should organise your holidays. Hope this post helps and may you have an ENJOYABLE and PRODUCTIVE holiday