This site is under construction.
Meanwhile, you can:
..try the C tutorials at:
Learn-C.org
C4learn.com
LearnToSolveIt.com
CodeCombat
...more to come soon!
..or test your C skills at:
Codechef
Gowrikumar
Codingame
Programming Practice Problems
Simple Programming Problems
Cprogramming C Challenges
...a lot more soon!