Hey,
I had a look through Heinemann 3rd ed today, and I definitely wish that I had this book during year 12. It has exactly what you need, simple (straight forward like what Aysce said)- and no extra information.
When I had studied biology, Biology in Focus (along with other people's notes) was my main staple for information. The upside to BIF is that unlike Heinemann, it will often go into much more depth with each dotpoint to assist a better understanding of concepts - such as where the ideas may come from, and its varied examples. The down side is the 'extra' (just too much, sometimes) information usually confuses many students and put them off study. This is because they may be constantly fretting over and asking yourself - do I need to know 'this' part of the paragraph, do i need to know'this' word (not so great during a stressful situation). In that way, if you are planing to make your own notes from BIF it can be very time consuming due to the process of extrapolation.
I strongly recommend starting off with Heinemann when you are studying a particular dot point, and then moving on to BIF. It is advantageous to have various sources for study as others have stated above. I find that with Heinemann, though, there are situations where the information needs/lacks further elaboration - which is where BIF can come in to supplement. BIF also has very detailed diagrams to aid with learning which is a plus.
TLDR: Use both. Heinemann first, then BIF.
Biology in Context (3rd ed) is also another great textbook.