Ah HCA...done it for 5 years now...on wards,in palliative care and in the community. The roles and tasks and what you are exposed to are very different depending on where you are working. You have more responsibility in the community and obviously have to be eagle eye trained to spot developing crises as you wont have that support on a ward.999 is your immediate port of call unless the EWS or T,P,R just warrants calling out an on call GP.
On the ward, you have obs that need doing at a specific time.You may have other duties such as bathing patients, feeding, moving and transferring,bed making, poo wiping, toileting, and equipment sanitising and paperwork that never ends. Recording of Obs,patient well being and be sure to hand over all info to your nurse in charge/care coordinator at the end of the shift.
Oh and hand gel is your best friend.
For interviews,you can be asked how you would deal with a non cooperative patient (you will get those quite frequently), how you would address a situation where a patient disclosed abuse, how you would prioritise tasks? how you deal with interpersonal conflict? how would you go the extra mile for patient satisfaction.
Good luck