Red Cross First Aid and CPR class

Today I attended for Red Cross CPR and AED class. This is practical. For CPR, I used to learn 15 to 1(Compression to blow)ten years ago, but now this ratio has been changed, 30 to 2. When I was working for a Japanese airline as an interpretor few years back,somebody pointed out this changes.
However, in mind old knowledge hampers me. I do need to revise these information time to time. Though this class is scheduled for students to attend, but the results are not affected to the study at all. But it's always nice to know and practice skills to apply properly for any chance. Now time to sleep. Day 2 is coming!