自習(じしゅう)self-study, teaching oneself

塾(じゅく)の自習(じしゅう)室(しつ)で自習(じしゅう)をしました。

I studied in the self-study room at the cram school. {self-study, teaching oneself}

明日(あした)はテストなので、自習(じしゅう)をします。

Since there is a test tomorrow, I will do self-study. {self-study, teaching oneself}

先生(せんせい)が教室(きょうしつ)に来(こ)なかったから自習(じしゅう)をした。

I studied by myself because the teacher did not come to the classroom. {self-study, teaching oneself}

普段(ふだん)はともかく模試(もし)の前(まえ)は自習(じしゅう)をしないとまずいです。

Regardless of the usual times, it's not good if you don't study on your own before a mock exam. {self-study, teaching oneself}

自習(じしゅう)をたっぷりした。それなのに試験(しけん)で良(よ)い点(てん)を取(と)れなかった。

I studied a lot on my own. Despite that, I couldn't get a good score on the test. {self-study, teaching oneself}