Sorry but IPU affiliated college doesn't accept the MAT score, they have their separate entrance exam which is known as IPU-CET, so one should go for this entrance exam if they are seeking admission in IP university.
MAT score has separate colleges, which are also good as per their Return on investment and average package. It all depends on your MAT score, accordingly you get an invitation to take admission in that particular college, which is best-fit according to your overall MAT score and they can also judge you on different parameters it totally depends on the college to college.
So if you have given MAT and scored good percentile then you can go for the colleges which are accepting MAT score. I hope you can find a good college under MAT also, according to your overall percentile.