I have 62% in 10th, 47% in 12th, and 45% in graduation. If I score equal or above 97%, will I get a call from FMS Delhi? I'm from the SC category.

Assuming that you have a graduation score greater than or equal to 45%, it is possible. But you will have to justify your academic performance in the interview and convince the panel that you will do exceedingly better than what your profile suggests. Considering the kind of candidates that FMS can choose from, it would take you quite an effort to do this.

It would be wise to keep your options open instead of putting all your eggs in one basket. Convincing the panelists is just one part of the story. You will then have to significantly transform your CV, become mentally prepared to be rejected by a few companies and crack the final process during your placements. So, you should take a couple of mocks or solve the CAT 2019 paper, understand the bracket that your final score will probably lie in, and then focus on those institutes.