It seems that the quality of your notes (which is an important element that contributes to the effectiveness of your studies and preparations) is not an issue, especially when considering the fact that you're aligning your notes with the syllabuses of your respective subjects.
Regarding your case, I can think of 3 important elements to consider:
- Frequency
- Consistency
- Regularity
Frequency in this case refers to how often you're going through your notes across your subjects. This is important because, as you may already know, going through your notes once may constitute insufficient (and potentially ineffective preparation, particularly if there are particular concepts you don't fully understand). High frequency is intended for you to be able to thoroughly understand and become able to effectively manipulate the content, allowing you to perform well in your assessment tasks/exams. This also allows you to (if applicable) identify areas of improvement in addition to any specific concepts that you don't fully understand, and subsequently seek assistance with those accordingly.
Consistency refers to your ability to maintain the aforementioned element to a high standard throughout year 12. This addresses factors such as motivation, determination, diligence and overall effort that you put in to be able to be consistent with respect to your studies and preparations, allowing you to maintain said frequency, which is ultimately desirable as it will likely contribute towards favourable performance.
Lastly, regularity is concerned with the time intervals you allocate towards frequency. For example, if you are taking a content-heavy subject (as mentioned above, listing your subjects would allow for more specific advice to be given) and decide to go through your notes covering a particular topic twice a week in an attempt to develop your understand and knowledge of this content, and because revision is important (so that you don't forget what you have learned, i.e. maintain familiarity), should you be repeating the process of going through your notes twice a week? If so, how many times should this occur?
I hope this helps!