These links take you to some review exercises you can try:

Metals, rocks and atoms (not the fuels bit)

http://www.bbc.co.uk/schools/gcsebitesize/science/aqa/rocks/metalsrev3.shtml

Acids, base and salts (not the electrolysis)

http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa/ions/

Atomic structure and bonding

http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa/atomic/

Balancing formulae (this is much harder than you need)

http://education.jlab.org/elementbalancing/index.html

Lots of tutorials

http://lgfl.skoool.co.uk/keystage4.aspx?id=316