。
Whether you study or not is up to you.
Literal
Study [also-も] not-do [also-も] you-[depending on-次第] is.
~も~ないも is a 'whether... or not' construction — presenting both options with emphatic も. 次第 ('depending on, up to') is a suffix that attaches to a noun to express 'it depends on X,' 'it's up to X': 運次第 (depending on luck), 君次第 (up to you), 気分次第 (depending on mood).