Hi Lala, welcome to the Forum. I guess you already have a student visa but you haven't said what you will be studying.
The ONP (Overseas Nurses Programme) that you mention is run by universities in the UK and you need to complete that to be entered on the NMC (Nursing and
Midwifery Council) Register as a nurse. You also need to have practised as a registered nurse in Philippine hospital(s) for a year. All the requirements are in the NMC booklet "Registering as a nurse or midwife in the United Kingdom for applicants from countries outside the European Economic Area" (19 pages). www.nmc-uk.org
Another website which may be of use is www.pnauk.org.uk (Philippine Nurses Association of UK).