I've got a full mark on this test.

　　这次考试我得了满分。

　　You must have prepared very well.

　　你一定准备得非常好。

　　Sure thing. I've learned every question by heart.

　　当然。我己经把每道题都背下来了。

　　No wonder you did a perfect job. You deserve it.

　　怪不得你得了满分。这是你应得的。

　　learn by heart 记住，背诵

　　perfect a.完美的;完全的;完成时的 vt.使完美