合格ごうかくの連絡れんらく、すごくうれしかった。

goukaku no renraku, sugoku ureshikatta.

I was so happy to get word that I passed. casual

お手紙てがみをいただき、大変たいへんうれしく存ぞんじます。

o tegami o itadaki, taihen ureshiku zonjimasu.

I am most pleased to have received your letter. formal