Look at the Data Digest, https://www.purdue.edu/datadigest/; it may give you a historical perspective on how you compare to other applicants for the college to which you are applying.
Also, Purdue’s Common Data Set, see https://www.purdue.edu/oirae/resources.html, can provide statistical information at Part C that may be useful in helping you gauge your chances. It will also tell you, under Part C7, what factors are “very important,” “important,” “considered,” and “not considered” in admissions decisions. You can look at how you performed in these categories, and perhaps get some idea from that of your chances.