i did quite a lot of biochemistry in my first and I highly recommend these two books if you wanna pass your exam in biochemistry: both entitled Biochemistry, one is by Stryer and the other one by Matthews and van Holde.
Both books are fully illutrated with coloured figures and diagrams. As both are quite big books you can expect detailed explanations on each topic covered in the books. However, the text is easy to understand, especially with the aid of coloured figures. One thing I like about Stryer is that at the beginning of each chapter there is this 'opening image', which is usually the structure of the key molecule in that chapter (e.g. DNA or RNA). Another good thing about Stryer is that at the end of each chapter there are some questions testing your understanding and answers are provided at the back of the book. The topics covered in Matthews and van Holde are more or less the same as those in Stryer but the cover of Matthews and van Holde is definitely more attractive than Stryer's!!!