Your class XIIth percentage is quite problematic, but you have tried to cover it up and compensate it by performing well in your undergraduate studies. Google is not very hungry for fancy degrees and tries to provide everyone a fair chance, so you can actually get an interview call from Google if you communicate with the HR nicely.

Moreover, keep your practice in Data Structures and Algorithms as this is the major thing which is asked in the interview. So, do these things and you will definitely get through. All the best!