1. He wants to make an appointment for his interview.
他想预约面试。
还能这样说：
He wants to arrange this interview in advance.
He wants to reserve the interview.
应用解析：
keep one's appointment 守约；
throw up one's appointments 辞去职务

2. When is it most convenient for me to visit you to talk about the position?
何时方便我去拜访一下谈谈工作的事呢？
还能这样说：
When is it available for you to talk about the position with me?
What time is it convenient for me to know about the position?
谚语：
Talk the talk, walk the walk.
说到做到。

3. Please arrive here on time tomorrow afternoon to have an interview at 3 o'clock.
请在明天下午三点准时来这里面试。
还能这样说：
Please attend this interview on time at 3 o'clock tomorrow afternoon.
Please come here to attend this interview on time tomorrow afternoon at 3.
谚语：
It's better to travel hopefully than to arrive.
满怀希望在旅途，胜过到达目的地。

4. I am calling to ask the exact interview time.
现在我打电话来想问下确切的面试时间。
还能这样说：
I want to know the exact interview time.
I am calling to confirm the exact interview time.
应用解析：
be more exact 更精密地，确切地说