my advice: study hard, read the whole K&B book at least twice. Do lots of mock exams. Then review your wrong answers in these mock exams - this is very important. Write a lot of small programs to make clear all the concepts which you are not fully comfortable with.
Some mocks are free and for some you must pay. There is a great exam simulator called ExamLab (you can find it on google) which is free and contains 5 full mock tests. Another free exam simulator is Inquisition.