No need to worry, as a fresher no one is going to ask you develop a big complex web site , the interviewer will only ask some basics and concepts nothing else. no need to worry.
First step is aptitude so prepare well, for that and after that you have to prepare the fallowing.
1.One Programming Language:You have to perfect in one programming language(Either C or java any one)Chose one programming language and read all the basics, and learn some programs.
Example
1.Palindrome
2.Prime no test,
3.Fibonacci series.
4.Amstrong