I agree with Rahul the excel book for Sdd is pretty good. I have used it and for my half yearliez i am coming 1st s0o far. but my teacher has only marked a small section of it so yah. hehehehe i left out some questionz due to time but yeah the exam was pretty alrite. =0)
Juz use the book to revise by reading it and just doing the exercises they have at the back, or u could do wat i did which was jot down the important notes of the topic and then put them into my own words and just everyday i read up on them and add new onez keepz it fresh in yah head. heheeh better then cramMing. where u dont learn nothing.
thatz juz my 2 centz
g0od lUck to yah.