It's not enough just to go to an English conversation class for studying English.
Going to an English conversation class is not enough on its own, if you want to get good at English.
"It's not enough just to got an English conversation class for studying English"＝「英会話教室に行くだけでは、英語の勉強として十分ではない」
"Going to an English conversation class is not enough on its own"＝「英海教室に行きだけでは不十分だ」
"it you want to get good at English"＝「もし英語を上達させたいのであれば」
アメリカ合衆国 
