Keep taking the lesson until you finished 100%, even if you earned 45 (net speed) words per minute after completing the first part (about 11% complete like the screenshot below) with 95-100% accuracy.
When you are finished (100% Lesson Progress) take a screenshot like the one below and make sure that it shows your userID in the top right corner.
If you earned 45 WPM Gross with 95-100% accuracy after completing the entire lesson, go ahead and complete the next lesson now if you have not worked on typing for 45min since you do not have to practice extra lessons for this section.
If you did not get 45 WPM Gross with 95-100% accuracy, then spend some time practicing lessons that you think would help you with your weak keys. Take screenshots of your results each time you complete a lesson to show that you are trying to improve.
Post your screenshot(s) that show your typing results (lessons and any practice lessons if needed) to Posterous (tag is tutTyping or tutorialTyping). Post the link to the Typing Spreadsheet. Remember, this is only practice for the Typing Quiz later in class.