Wish

[Ionlyseedaylight]

I have a wish to achieve success in this exam and to learn everything about mathematics, chemistry and physics. Whom should I contact for help? Any demon or ritual that can help?

 

[Fiery Pluto]

Gods that can help you with specific problems:
https://www.joyofsatan.org/www.angelfire.com/empire/serpentis666/HELP.html

How does a demon teach you? by Hp.Hoodedcobra:
https://www.ancient-forums.com/viewtopic.php?f=24&t=77605

To establish a relationship with a demon that can teach you, you can make a summoning ritual as described in jos or just asks for the help of the god using his sigil.

 

[Kaemythra]

I have a wish to achieve success in this exam and to learn everything about mathematics, chemistry and physics. Whom should I contact for help? Any demon or ritual that can help?

There are numerous ways. Programming your aura, hypnosis ( witchcraft page on Jos, I think it is a bit advanced if you are new. ), magic works to increase intelligence ( have it here on the forum ), on the gods of hell page you can get information from the gods that can help in math..etc