Splug gave an excellent link above.
I also recommend the spirit, Namru from the *Simon’s Necronomicon
“Dispenses wisdom and knowledge in all things. Giveth excellent counsel and teaches the science of metals. His Word is BAKAKALAMU.”
"One reader writes to us and says, “Although I am excellent in most of my subjects at (a college on the East Coast), I am a general failure at science. It was then that I got a copy of your NECRONOMICON and my eyes fell on the seal of NAMRU. I prayed the night before an important Chemistry midterm exam to NAMRU and carried his seal into the classroom. I passed a test I thought I would never get a 35 in with an astonishing 85. Suddenly, it just seemed that I understood the subject for the first time in my life.”
I can testify to Namru’s help. He helped me get a technical certification years ago.