Está aí um ótimo site de desafios, com desafios web/aplicação.
Muito bom para ver seu nível e se está preparado para os verdadeiros desafios.
http://www.hackr.org (http://www.hackr.org)
Meu profile é BlackCoder.
Beginner/Novice Challenges
Level 1 - Completed (28116)
Level 2 - Completed (19792)
Level 3 - Completed (19124)
Level 4 - Completed (12065)
Level 5 - Completed (7904)
Level 6 - Completed (8376)
Level 7 - Completed (9241)
Level 8 - Completed (8621)
Level 9 - Completed (5900)
Level 10 - Completed (6374)
Level 11 - Completed (7821)
Level 12 - Completed (6273)
Level 13 - Completed (5343)
Level 14 - Completed (6552)
Level 15 - Completed (5213)
Moderate Challenges
Level 1 - Completed (1976)
Level 2 - Completed (3827)
Advanced Challenges
Level 1 - Not Completed (999)
Level 2 - Not Completed (853)
Level 3 - Not Completed (676)
Level 4 - Not Completed (216)