Tā zài zhǔnbèi kǎoshì, yǔcǐtóngshí hái zài dǎgōng.
He is preparing for exams and working a part-time job at the same time.
Tips
usage
与此同时 is more formal and written than 同时 (tóngshí). It typically appears at the beginning of a second clause to introduce something happening concurrently.
