The thing a drama school can't give you is instinct. It can sharpen instinct but that can't be taught, and you have to have intuition. It's an essential ingredient.
If you have never been tortured, or locked up and verbally threatened, you may find it hard to believe that anyone would confess to something he had not done. Intuition holds that the innocent do not make false confessions.
Mathematical reasoning may be regarded rather schematically as the exercise of a combination of two facilities, which we may call intuition and ingenuity.
Being in a multicultural environment in childhood is going to give you intuition, reflexes and instincts. You may acquire basic responsiveness later on, but it's never going to be as spontaneous as when you have been bathing in this environment during childhood.