There are four books if you prefer using New General Mathematics series. Start from Book 1 and learn all basic principles as enunciated by the syllabus. Majority of candidates think that it's easier to master O Level principles without covering the Junior Level Mathematics. O level principles build upon the foundations laid by Junior Course.
Basic Mathematics principles are widely tested in paper 1. Many people can testify that they wrote the exam without knowledge of estimations like significant figures and rounding off figures. Some O levels chose to ignore things like type of numbers, they don't even know even numbers, prime numbers and integers. These principles are tested in sets and limit of accuracy.
The tricky part of using Book 3 is that it has assumptions. It expects users of that book to have covered all principles in Book 1 and 2 , and continuously refers you back to their previous books in the series.
However, nowadays New General Mathematics, Although it's still considered the best book for O Level, there are other simplified books with more relevant information to the current syllabus. Look out for books like Maths Today and Revision O Level Mathematics.
My Advise
1. Start by learning basic principles of numbers, types and operations on numbers (BODMAS)
2. Master directed numbers
3. Learn how to estimate numbers to decimal places, significant numbers and place values
4. Learn basic algebra and formation of algebra from a given statement
5. Learn Mensuration in Junior course, it's also tested in paper 1
6. Learn how to use scientific calculator in fractions, decimals and graphs
7. Master units of measurements, capacity principles and time
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