I think you got a similarity for the title of this post and the well known book by Chetan Bhagat, 'The Three Mistakes of My Life'. I want to say that you have done three mistakes in your life if you haven't read his first three books. Just now I feel like that, just after finish reading his third book.
You all may have heard about Chetan Bhagat or some of you at least may have read his book. But I would like to say that you have made three mistakes in your life if missed any of his books from reading. All the three are real non-stop entertainers. Once you start reading, you may not feel like keeping the book down for real.
I would like to make a small review of his first three books. First let me start with 'Five Point Someone - What not to do at IIT'. This is a book which gets all back into the campus days which are always in the happy corner of the memory. As an engineer, you may like it more. This is having some similarity with the story of the block buster film '3 Idiots'. Even if you seen the movie also, it is quite worth to read it.
The second one is 'One Night @ the Call Center', is also may be familiar to you all since this exactly got into as a movie, 'Hello'. Though the movie couldn't make that much in the theatres, the book is a story which is having a real story touch.
The third one to hit the stands was 'The 3 Mistakes of My Life', which says the story of three friends from Ahmedabad, the city of business, whose aim also nothing else but to become businessmen. This tells in a real touching way how they start with and ends up with many difficulties.
So all, read these and avoid doing the three mistakes.