my son is in 10th class (CBSE) and is willing to join engineering college. what is better now for him- should he join coaching classes for iit/jee preparation while studying 11th and 12th class or just first concentrate on 11th and 12th course and only after that jon any iit/jee coaching class? As now govt. has decided to add benefit of 11th and 12th marks for iit/jee aspirants.