Megan Atwood 
Break the Code [PDF ebook] 

The prize: $10 million The rules: Be the first to complete ten tasks assigned by the Benefactor. Do not ask questions. Do not tell anyone what you’re doing. Do not fail. The consequences: Unknown Maiv is a model daughter, a caring older sister, a top student the responsible one. She’s not someone who’d get mixed up in something as risky as the Contest. But the huge prize would help her afford college and help her family make ends meet. The problem? The Contest is not what it seems. On the other hand, neither is Maiv. She’s determined to uncover the Benefactor’s secrets before it’s too late.