Engineering entrance exam should be conducted on the basis of fields or branch and should be different for different branch . Also the separate entrance  should  have  the subjects necessary for  that branch . For example Computer science engineering entrance must have Computer science as their subject with necessary parts of PCM required in it . It's just an idea which will lead to more better engineers from respective branch if implemented at India level(IITs ). As the students will prepare quite hard for the entrance they will Clear the basics of the main subject of the branch ( like Computer science in computer science engineering) and this will lead to more better engineers. Also those who are good in the main subject but are not so good in PCM can also follow their passion in this system