I have been teaching an undergraduate course involving some A-level standard core mathematics. This book has been a great refresher for me, and has been really helpful to my students as well. Colin has a friendly conversational writing style that takes away any "fear" about maths, and breaks each topic down into easily coped-with chunks. I would recommend this to anyone trying to bridge the gap between GCSE and A-level, and those of us returning to the topics some time (15 years in my case) after first studying the subject. Undergraduates will find it incredibly useful too.