NSLog(@"%@",[dict objectForKey:@"A1M1_01"]);

<dict>
    <key>A1M1_01</key>
    <dict>
        <key>lessonDisplay</key>
        <string>A1M1 Lesson 1</string>
        <key>test_01</key>
        <dict>
            <key>answerA</key>
            <string>I'm</string>
            <key>answerB</key>
            <string>he</string>
            <key>answerC</key>
            <string>I</string>
            <key>answerD</key>
            <string>me</string>
            <key>correctAnswer</key>
            <string>A</string>
            <key>graphicPath</key>
            <string></string>
            <key>howManyButtons</key>
            <integer>4</integer>
            <key>question</key>
            <string>Complete the sentence:  Hi, ______  John.</string>
        </dict>
        <key>test_02</key>
        <dict>
            <key>answerA</key>
            <string>bag</string>
            <key>answerB</key>
            <string>plane</string>
            <key>answerC</key>
            <string>name</string>
            <key>answerD</key>
            <string>flag</string>
            <key>correctAnswer</key>
            <string>C</string>
            <key>graphicPath</key>
            <string></string>
            <key>howManyButtons</key>
            <integer>4</integer>
            <key>question</key>
            <string>Complete the sentence:  Hello, my ______ is Mary.</string>
        </dict>