For your exam studies, I would recommend you to concentrate only on what you understand and just think, perfect!
You won't feel motivated if you dwell too much on what you don't understand.
ご質問ありがとうございます。
"For your exam studies,"＝「試験勉強のため」
"I would recommend you to concentrate only on what you understand"＝「あなたが理解している部分だけに集中するよう勧めるよ」
"and just think, perfect!"＝「そして、完璧！と思うように。」
"You won't feel motivated if you dwell too much on what you don't understand."＝「分からない部分にこだわるとやる気が出ないから。」
ご参考に。
When studying for tests I recommend doing the parts that you know and thinking that its perfect!
"試験勉強で、わかるところだけやって、完璧！と思い込む"
- When studying for tests I recommend doing the parts that you know and thinking that its perfect!
「試験勉強で、わかるところだけやって、完璧！と思い込むことをすすめるよ！ わからないところにこだわってたら、やる気出ないから」
- When studying for tests, do the parts that you know. Then, think perfect! I'm doing great! (私はよくやっている）You won't feel motivated if you just concentrate on the parts you don't understand.
アメリカ合衆国 
