Adjective + する

This pattern is useful for describing a change in something.

To say that it has become cold, you can say:

寒くになりました

similarly, become good at something is:

上手になる

You can also combine with する　instead of なる, in order to say "to make"

For instance:

冷たくする -> to make something colder

コーヒーを冷たくする - make the coffee colder

簡単にする -> make something simpler/easier

数学を簡単にして下さい -> please make mathematics easier! (to understand)


How would you say, "Please make the next exam easier, because the last one was too difficult"

前回の試験は難しすぎたから、次の試験を簡単にしてください

or

この間の試験は難しすぎたので、次の試験はやさしくしてください

I made the room clean

部屋をきれいにした

I want to make my hair look like Daniel Craig's

髪をDaniel Craigみたいにしたい

make it quiet

静かにしてください

All in all, it's a pretty simple and useful grammar to know.