How can i improve my focus and memory


I have the following problem im writing here because its the only forum where people talk about dual n back.
Im 1 step away from schizofrenia and im scared.
So i want to do some exercises to improve my focus.
My higest dual n back score war 3.63 ive been doing it for about a week 20 minutes a day.
Does dual n back actually improve your focus?
And if i manage to get to level 3 but then regres to level 2 should i start with level 3 and keep at it untill im good at it push miself even i get 0% correct?
Also from lumosity what would be some great exercieses from there?


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