Fetching details from the dictionary...

upper level; upper grade; high rank; advanced level; senior level; upper class
上級コースに進むには試験がある。
There's an exam to advance to the advanced course.
上級者向けのコースは難易度が高い。
The course for advanced students has a high level of difficulty.
日本語の上級試験に合格するのが目標だ。
My goal is to pass the advanced Japanese exam.