In your case it isn't a problem. From what I understand you have finished secondary school right? You want to do a BSc in Nursing? You will have to explain in details why you chose nursing. Remember Nursing is a noble profession. You really need to sit down to put things down. Your future career goals and aspirations. Which type of nurse do you want to be. (Things like Midwife, Paediatric nurse etc). Also you need to make them believe you aren't choosing nursing because of the money but rather the passion you have. Again talk about your present job. Things like why working in a travel agency. You love the job but your greatest passion will be to become a nurse. Link it with how you will come back to Nigeria and improve the health sector. These are my thoughts. Finally be positive. I wish you the best.