Dear Anubhav,
You are thinking two different directions to be completed in a single shot, which is not possible.
You should decided, whether you want to become SAP Consultant or go for CAT MBA.
No SAP training would give you a guarantee of job. What if, if you do not get the job after training? Getting job with simple SAP training has almost become impossible, there are very few exceptions to this. If you need to authorized centres list, please contact SAP, they would be able to give you further details. Any other institutes are legally not valid. You have authorised training partners like Genovate, ATOS etc. are there. There is no guarantee that your Certification would get you a guaranteed job, more it is not a job guarantee program.
With reference to CAT, it is extremely difficult to get into. I am not discouraging you, but one of the toughest entrance examinations in the world. You must be very best. Forget about your 10+2 scores, you should get above 99.9% scores in entrance, still no guarantee. It is a complete strenuous program, you should dedicate nearly 16 - 20 hours a day during the MBA program. I would say getting into IIMs is next to impossible task. This is not like other MBA entrance test, you should have at-least one year planning and 12 - 15 hours hard work a day and to crack IIM entrance, still 99% people would fail, only 0.01% cream of the cream people would go in.
First of all you need to decide what you are intending to achieve in life. You cannot eat everything right now.
All the best.
Kind Regards,
Ravi