I am 25 years old, I have completed my bachelor degree from electrical engineering. So what should I do to become a pilot?
If you plan to train and fly in the US...
You should spend that money on an MSE or MBA, get your private/instrument, and then buy your own plane and fly whenever you want.
However, if you feel you must become a commercial pilot you should find a local flight school and lay out a plan with someone who has authourity to negotiate pricing.
-lay out your objective. You are paying for a private license, instrument, all of the time building for commercial, and then commercial. That's a minimum of 250 flight hours plus a lot of billable hours for a very lucky CFI. You can negotiate an awesome rate if you guarantee the school that business in s short amount of time.
-DO NOT pre-pay more than $1000 at a time. Keeping funds on account is fine, just don't give them more than you're comfortable losing if suddenly they close. It happens.
-stick to a schedule. Fly a lot. It's cheaper to knock it all out at once. You have to relearn stuff if you only fly once or twice a week.
-don't get caught up comparing part 61 and part 141 schools. Just go with the most affordable option.
-research airline minimums. A commercial cert won't necessarily get you a job. If fact, a commercial cert means very little wothout hours to go with it. Think about adding a CFI cert to your shopping list.