Cracking the Coding Interview by Gayle Laakmann McDowell is a must have for anyone interviewing for software engineering jobs. Whether you are preparing to interview for your first internship or you are an experienced professional, this book is a comprehensive walkthrough to prepare you for the process.
The beginning of the book describes typical examples of the technical interview process and covers some core computer science theory. The second two-thirds or so of the book covers programming practice problems and knowledge questions followed by a detailed solutions section.
Going through the practices problems in the book is a great way to refresh old skills or identify knowledge gaps you need to focus on and give you the confidence you need to be ready for the interview process.