1.教琴工作 is a Selfemployment. You are the boss.
2.會計部工作 is working for some one and is in the junior grade.
Set up you own goal la.
3.But hv to be realistic as 學左鋼琴年多,明年順利考三級 sounds a little bit lag behind. Normally, 3-4 years could be finished up to 8th grade of piano. (could jump grade! hkg piano teachers commonly not allow this as they wanna keep students longer!)
4. 8級教人 not likely, normally with a Diploma. Those only with 8th grade piano teachers are water skin cha!