Haha I need to do that too! Well here's a mnemonic for the first THIRTY elements if it helps ^.^~ the first letter or letters are the symbol for the element:
Happy Henry Likes Beer But Could Not Obtain Food
Hydrogen, Helium, Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine
Nellie's Naughty Magpie Always Sings Pop Songs Clearly After Killing Cathy
Neon, Sodium, Magnesium, Aluminum, Silicon, Phosphorous, Sulfur, Chlorine, Argon, Potassium, Calcium
I made these last ones up so they kinda suck ^.^ :
Scoring Tiny Vans
Scandium, Titanium, Vanadium
Crossed Mens Feet Collect Nice Cute Zebras
Chromium, Manganese, Iron, Cobalt, Nickel, Copper, Zinc
I hope it helps! It definitely helped me~ xD Good luck on your test btw!