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what is the most effective dose for mathematics?

PostPosted: Sat Dec 28, 2019 4:21 am
by SadDark
what is the most effective dose for mathematics?

I have exams I want to study effectively.which is the best dose HELP :(

Re: what is the most effective dose for mathematics?

PostPosted: Mon Feb 17, 2020 6:58 am
by Frankie
What does the dose level depend on?