Urgent help needed regarding TCS - PLZ HELP ME

I NEED YOUR URGENT HELP

actually i am TCS (Tata Consultancy Services) aspirant and got all the previous year question paper sets.

but the main problem is that i am not getting the step by step solutions to many tough questions

TCS is on 12th at my college

please help out if you know from where i can get the complete step by step solutions to all questions

plz help, its a matter of my career, PLZ REPLY