You will have to clear management entrances like CMAT, XAT, MAT,CAT, NMAT, SNAP etc to get admission in top management institutes.

There is basic eligibility percentage mentioned in CAT that you need minimum 50% in graduation unlike in CMAT, XAT there is no minimum percentage requirement.
The best part is that the past academic records are not given much weightage and you have a chance to get into good bschools in India through XAT, CMAT except CAT where past academic records are considered.

Forget about the graduation percentage but now you should aim at the preparation, good percentile like really good so that your academics are not a barrier in between if in any case they tend to be.
Otherwise its not exactly that you will not get good colleges. If you get the good percentile and crack the interview and impress the panel you can make it to the admissions in good bschools.

Prepare from previous year sample papers and analyse them, give sectional and full length mocks, analyse them, there should be a definite practice time and practice sincerely.

Try to get above 95-97  percentile to get the tier 1 colleges.



All the best.