As per Francis . You need to do practice and hard work to develop your programming skills. and most important clear basic OOP concepts. Without basic of programming you are nothing in programming.

As others have already pointed out practice makes perfect. You need to build stuff so that you encounter various problems which then you need to solve. This process will increase your problem solving skills which are essential to programmers. Another thing that you can do to enhance your skills is by solving some coding challenges, for example check out TestDome for some programming tests: http://www.testdome.com/ They offer a nice collection of tests (for various programming languages) that you can try out. Additionally I would recommend you to also try their aptitude tests: http://www.testdome.com/Aptitude-Tests These ones also indicate your programming capabilities.