I would advise them to use the search function on this page to look for the many similar queries and many many pages of advice that have been given :-)
I think there is a lot of good advice on these boards and lots of great posts. In summary I would give the following advice to specifically undergraduates
Don't limit your studies to HR - try and expand your horizons to finance and other areas.
Network as much as you can with your local branch and the wider HR community
Try and gain work experience while studying in HR but also in other fields
Grasp opportunities even if you are not sure you have 100% of skills for them
Look for roles and projects that excite you be they in HR or outside HR
Don't assume a HR degree is a golden ticket - you will have to work very hard to get your first job in HR
Exploit ruthlessly any contacts you, your parents or your friends parents have to get into your first roles
