This verb is irregular, it cannot be conjugated regularly.

He was in charge of the musical arrangement of the song.

He arranged the music.

She is good at writing hentaigana.

He is good at playing the bianqing.

He succeeded in transferring to the University of Tokyo.

He was able to transfer to the University of Tokyo.

His picky eating makes it difficult for him to lead a healthy diet.

He is picky about his food and doesn't eat vegetables at all.

Observing variable stars is an important part of astronomy.