Motorkhana's as SAU know it, are fairly loose to the term. DECA is what SAU associates with Motorkhanas. Big open skid pans with tyres frying, Brisby, smashing cones, Brisby, gate, Brisby, limiter, Brisby, drunken behaviour, Brisby.... get the idea??
CAMS stlye Motorkhana's are limited to size of course, obstacles (including size) and car specs. There are different requirments for each class. Classes are determined by wheel base and whether the car is fwd, rdw or awd.
Check this link out for some idea of what a CAMS motorkhana is.