Ambuja Cements has reported 6.57 percent increase in standalone net profit of Rs 520 crore during the January-March quarter mainly on account of higher income. The company had clocked Rs 487.90 crore profit in the same quarter of last fiscal. During the quarter under review, total income of the company rose to 2,649.34 crore as against 2554.83 crore in the same quarter of 2012-13.