There are some high schools that are hard to get into and other high schools that are easy to get into.
Some high schools in Japan are harder to get into than others.
この場合、次のような言い方ができます。
ーThere are some high schools that are hard to get into and other high schools that are easy to get into in Japan.
「日本には入りにくい高校と、入りやすい高校がある」
high schools that are hard to get into「入りにくい高校」
high schools that are easy to get into「入りやすい高校」
ーSome high schools in Japan are harder to get into than others.
「日本の高校には他校より入りにくい高校がある」
「他校より入りにくい…」ということは、他校は入りやすいとも言えますね。
ご参考まで！
Among Japanese high schools there are ones that are easy to get into and ones that are hard to get into.
"日本の高校には入りにくい高校と入りやすい高校がある"
- Among Japanese high schools there are ones that are easy to get into and ones that are hard to get into.
- Some Japanese high schools are hard to get into and some are easy to get into.
カナダ 
アメリカ合衆国 
