Answer:
I love writing emails, so this is going to be great haha:
Hey Alex!
Great to hear from you! Wow, that sounds like a great opportunity! Yeah, I know exams can be stressful at times, especially when you have more than one to take at the end of the year. That's why I suggest preparing early so that you don't fall behind and are still able to enter the film. This is a once-in-a-lifetime opportunity that will get you one step closer to your dreams -- trust me, it's one you <em>don't</em> want to miss!
Thanks for reaching out to me today! Again, it was great to hear from you. Let me know what you decide to do and how everything goes!
Warmly,
[Your name]
It's less than 120 words, so you just have to elaborate a little. I would elaborate on your personal advice and better explain your reasoning (you will reach the word count requirement in no time!) I sincerely hope this helps! Have a good night!