Hi there!
I do biology and chemistry and I have also purchased dot point textbooks for both subjects!
I genuinely think that they're amazing, not only as a means of revision, but it's honestly such an amazing way for you to see whether or not you truly understand the content. My justification for purchasing them in the first place was built around the fact that when it comes to the sciences, the syllabus is your holy grail and because the textbooks cover every single dot point in the syllabus- it does a really good job to prepare your understanding of the context potential questions they'll ask in your finals

But I would really like to stress that by no means do you have to go out and buy it! You'll hear time and time again that in order to do well in your exams- it's the effort you put in and your preparation. Whilst the textbook is extremely helpful, it isn't essential for you to do well! My analogy is that you could have someone to tutor you for a subject, but if you don't put in the effort, it will definitely show in the form of your marks! Continue working hard and give it your all, I know you'll be fine!!

Good luck!