然后去警察学院学习。翻译成英文

Then go to study at the Police Academy.

Then the Police Academy to learn

Then go to the Police institution to study

Then I went to the Academy of Police.
(英文中go to school已经表达去学校学习的意思，再加to learn或to study多余了。另，动作属过去。)

Then go to the Police Academy to learn .