All, I tried Dan's topic wise exams as and when I completed by chapters. The exams are really useful and I leanred lot of fundamentals which I don't know before. In fact I did not touch classes,threads which I am going to do later. First I want to more practice in fundamentals like binary,decimal,shift operators etc. I think java ranch members have seen my questions on wrapper classes. I am wondering do Is there any other sites where I can find questions Topic Wise like Dan's. If any one of you know, please let me know. Your help is greately appreciated and I know @ javaranch people are very helpful and try to provide more info in detail. Thanks again.