From Centennials website even if you upgrade you will most likely not be accepted since you have repeated courses on your transcript. Perhaps, look at other schools and contact them.
College diploma in practical nursing with a cumulative GPA of 3.00 or higher (B average)
No repeated courses or failures on academic transcript
Note: To be eligible for admission to Ryerson University, Daphne Cockwell School of Nursing, students must maintain a cumulative GPA of 3.0 or higher with no course repeats or failures in this program (9251).
For Registered Practical Nurses
Transcripts from a community college diploma program (inclusion of courses in anatomy and physiology and pathophysiology) are required
Proof of current certificate of registration in Ontario
Clinical Placement Requirements
After admission, but prior to Clinical Placement, students require:
Annual clear police check with vulnerable sector screening
Completion of immunization requirements (immunization review form issued by the program coordinator)
Successful completion and annual renewal of a recognized course in CPR (Healthcare provider level)
Successful completion of a recognized course in standard first aid (recommended for RPNs who have not practiced within the last three years)
Mask fit testing will be provided by Centennial College (shaving of portions of face may be required to meet safety standards)
All of the above requirements must be in effect for the duration of each placement.