kickstart - You have been seriously misinformed and it would be interesting to know which schools are so incompetent/dishonest to have done this, perhaps you could name them.
Unless you are taking the ATPL-ATPL route (which involves the ATPL Skill Test on a multi-pilot aeroplane), you will have to complete an approved course of training for the Instrument Rating. Assuming that you have an ICAO compliant professional licence, the approved course is 50 hours + Skill Test - no exceptions.