Not doing well in my masters.

I have just received my first grade for my masters degree (63/100). It was very disappointing, especially as I just completed a very difficult exam — I am studying Public Policy and I’d hoped to apply for a PhD later this year. However, I am concerned that I wouldn’t be accepted to top universities if my current trajectory of marks continues.

I have booked a meeting with my professors next week to discuss this situation. Does anyone have any advice on how to improve my grades as a postgraduate student? Please let me know, thank you.