Good onya,
Firstly, go for the best grades you can. If you have language skills, highlight them too.
A degree isn't essential, that's for sure. If you're keen on the corporate world, see if you can get a job at a local FBO (Fixed base operator) or even up market hotel.
6 months of that will definitely give you an edge working with high net worth individuals.
With the FBO's job, you'll learn about what the crews need on a turnaround. Catering, fuel, aircraft servicing and the like. Also, you'll probably meet the crews who can give a "good word" to the recruiting team. Contacts are gold.
If I was in recruiting, which I am not.. if 2 guys the same age turned up looking for a job and they have the same grades, but 1 has a degree and the other has spent 3 years working in a busy FBO doing dispatch and customer service, I know who I'd be putting through to the sim check.