I hear it's a lot easier for Cadets to get into the RAF, unfortunately my parents always assumed the Aviation dream was just a phase for me so I was never allowed to join the Air Cadets.
This is not really true. It may be easier for an air cadet to acquire some of the knowledge, skills and experience but former air cadets are certainly not given an easier ride at OASC.
A well-used time at university that incorporates a challenging degree, ideally science-based, plenty of personal/leadership development (UAS/URNU/OTC or sports/outdoor clubs etc) and some voluntary work would be close to ideal but still no guarantee of a pass.