help) IAL studying...

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In Bio, Reading the book regularly could be useful to familiarize yourself with terms and concepts in the syllabus. But still, notes are helpful for many candidates. Before ignoring the whole note-making concept, try to make it in a different form. If you think you are too focused on the form of the note rather than the concepts, I think it's better to type the concepts out, because there is not much to decor in documents. And also, it's less frustrating. For example, if you write some concepts on a book, you would think that it's too precious to cross out your writing on it, even though the wording in your note is not good. But, in a document, you would simply hit the backspace key and correct it.

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To deal with past papers, all you need is just to familiarize yourself with the exam questions. Working on it could help on your way of thinking and dealing with the questions in the real exam. It is advised to print out question papers so you are accustomed with the minimum space they give us to write the answers. Specifically for chemistry, especially when working on organic chemistry, every time you are asked to draw a molecule, sketch it first and do not use a pen. And, when writing answers you are not sure of, do not immediately write it on the space given; Write it on another space, then cross out your writing on that space after you are sure to write an answer on the blanks.

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For the last question, I rarely review my class. It is more useful to review based on your development in your A-Level studies rather than relying on classes. Rather than using the class as studying new concepts, use the class as a medium of discussion between you, your peers, and your teachers. This is because many of the concepts is meant to be understood deeply through literature reviews and scientific thinking, rather than utilizing it as a given knowledge.