Succeed in examinations

I am Raman from Trichy. My Son is in +2 and he is traveling abroad on monday to participate in a essay competition related to space research.

Kindly give me a combination of flower remedies for his success. Thank you.

 Naran Sir suggested:

Waterviolet, Larch, Gentian, Wildrose, Chestnutbud - On the date of competition...

How did they work?