Ontario Highway Traffic Act

I was on highway 417 coming from kanata in the morning and i was going about 135 km/h according to the cop, when i thought i was only doing 125 km/h.. The officer reduced it to 119km/h probably because it was my first ticket but that still includes 3 demerit points. I really cant afford my insurance to go up and i need help on what i should do. any ...