Computer Science is a challenging course. At its heart, it requires you to solve problems. Not just mental problems like Sudoku, or the Towers of Hanoi, but big human problems too. Computer Science is a special subject that crosses the boundaries of other subjects - it is a humanities subject as well as a science and a branch of mathematics. Behind the algorithms and the technology there is also a fascinating story of human achievement. You can study Computer Science for a lot of reasons; it can be seen as a passport to a good course at university or a good career. The reason most likely to lead to success is that at some level you find the subject interesting and you expect to have fun doing it. Writing computer programs gives you "instant feedback", teaches you to persevere with problems that you may not succeed at the first time and great satisfaction once they are finally overcome.