Hi, you can check if there is noticeable amount of oil near the hole under the clutch. If yes possible problem with seal and O ring between engine and clutch.
Check the position of adjusting screw on clutch arm infront of rear wheel. If that screw with counter nut is out too much clutch friction plate is at the end.
Drive the bike, for example, 50 kmh in 4. and hit the throttle, if rpm rise too fast, clutch is worn
Finally chech the whole asembley from stand position: if you feel vibrations at start probably whole clutch is ready for change.
Best regards