1.I was preparing for SCWCD1.4 i brought the book and started preparing i searched the forum and found that SCWCD1.4 is closed and SCWCD1.5 is available. is this true.? 2.how different is 1.5 from 1.4? 3. will it be ok for me to continue with the same book or do i have to purchase and SCWCD5 book newly and start it.?