浅野です。
英検２級では２０１６年度から英作文が導入されました。テンプレート（ひな形）を作っておくのがよいでしょう。
２０１６年第１回の問題は次のようなものでした。
TOPIC
Today, some companies allow their employees to wear casual clothes like jeans or T-shirts. Do you think the number of such companies will increase in the future?
（http://www.eiken.or.jp/eiken/exam/grade_2/pdf/201601/2016-1-1ji-2kyu.pdfより）
１．問題文をそのまま使ってyesかnoかをはっきり書く。
I think the number of such companies will increase in the future.
このように問題文をそのまま使うと楽です。
２．Firstで始めてその理由を書く。
First, wearing casual clothes like jeans or T-shirts is more comfortable.
３．具体例を用いるなどして議論を深める。
And when we feel comfortable, we can be more productive. A friend of mine who works for a game company always wears casual clothes and draws very beautiful pictures. This is good for both employees and companies.
４．Secondで始めてその理由を書く。
Second, it is also good for the environment.
５．具体例を用いるなどして議論を深める。
If we are allowed to wear any clothes we like, we can adapt to hot summer or cold winter. Some years ago, Japanese business people had to wear formal suits even in hot summer. So most companies kept the room very cold using air conditioner unlimitedly.
６．語数が足りなければまとめを書く、語数が多ければ削る。
上記のものを全部足すと語数が少し多かったので、なるべく削って最終的には次のようにしました。
I think the number of such companies will increase in the future.
First, wearing casual clothes like jeans or T-shirts is more comfortable. And when we feel comfortable, we can be more productive. A friend of mine who works for a game company always wears casual clothes and draws very beautiful pictures.
Second, it is also good for the environment. If we are allowed to wear any clothes, we can adapt to hot summer or cold winter. Some years ago, Japanese business people had to wear formal suits even in hot summer. So most companies kept the room very cold using air conditioners unlimitedly.
やや物足りなさが残るものの、これくらい書ければ十分でしょう。