Among the three mentioned universities, Jadavpur University is the best to pursue BSc in mathematics Honours without any doubt. The classes are assured regularly and rigorous for those who desire to have a future in mathematics; there should be no doubt in selecting JU.
Comparison: (Winning Institution - Jadavpur University)
Jadavpur University contributes much more than just a degree that gives you quality education, which is not restricted to classroom learning. They make sure the students turn into the person they can be and gives them the confidence that no other college in Kolkata does.