I had my Dutch Language NT2 II Diploma in 1999. I want to share with you how I learned the Ducth language.
Here are some few tips:
be observant. what they do and say
be expressive. tell freely what you feel, express yourself, do it in a polite way
be honest. tell the mentor that you don't understand
be a member of (library) club
be a researcher, do not stop looking for answers till you find them.
be social. expose yourself to Dutch people, join the group
be an interrogator. ask if you don't understand
self study. don't rely the teachers.
listen to yourself. record your voice so that you will know if you get the right pronunciation
know your ability to learn. if you learn fast it is fine, if not then give enough time to study
study in your own tempo
don't give up. perseverance (doorzettingsvermogen)
lastly, be broad minded. accept individual differences, don't be angry if you are corrected. don't compare. everyone is unique.
GOOD LUCK TO YOUR DUTCH LESSON!!!