A report by COV-IND-19 Study Group dated 22/3 had predicted "In the absence of any intervention,India can expect to see an exponential growth...predicted cumulative cases on 31/3 is 379,on 15/4 is 4836 & 15/5 is 58643."

Even with intervention,almost 6,000 cases on April 9 itself

Link for the said report by 'COV-IND-19 Study Group'.
https://medium.com/@covind_19/predictions-and-role-of-interventions-for-covid-19-outbreak-in-india-52903e2544e6

This report has been cited in a IJMR paper by an AIIMS Doctor released today.

Link: http://www.ijmr.org.in/temp/IndianJMedRes000-6209268_171452.pdf