I want some really good psychological stuff. I've read death note and Boku wa mari and I love good twists.

Under psychological I'd suggest Aku no Hana, Annarasumanara, Banggwa hu Jeonjaeng Hwaldong, Hanged Doll, Houkago Hokenshitsu, Kiseijuu, Melo Holic, Murasakiiro no Qualia, Onani Master Kurosawa, Satougashi no Dangan wa Uchinukenai, Shigatsu wa Kimi no Uso, Shion no Ou, Superior Day, The Friendly Winter and Yuureitou.

All of these are completely scanlated, though you might have to look around a little to find all of them. Good luck finding something to read 🙂

Liar Game
Conductor
ES
Watashitachi no Shiawase na Jikan

Try Freesia and Bastard (HWANG Youngchan).

Thanks, any more?

ill suggest some of my favorite psychological.
Boku Dake ga Inai Machi -also has an anime which was done well
Melo Holic -this one has a pretty good twist 😉
Chumo Once Again -Short and also has a good twist
Conductor -also short but very good.

Sekai no Hate -this one is very very good but its not getting translated anymore

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Like educational manga? take a look at Ed U. Manga's list of manga here