For the past couple weeks, I have prepared for and completed the “Boss Challenge”. Once I have finished all the required missions to complete the Boss Challenge, I worked on and completed all other missions left in codingbat.com , in order to gain more confidence about my mastery. The quests were mainly focusing on checking basic concepts of python that I have learned, and my ability to apply them to solve various problems. The majority of the problems were not as difficult as I thought, though some problems, such as recursions, demanded a little more thinking. Now that I feel very comfortable with using what I have learned so far, I believe it is time to move on.