It depends what you mean by 'a successful life.' You could become a multi-millionaire and have a very unsuccessful life except in that one area. Success is the progressive realization of a worthwhile ideal. The achievement of great wealth might be the goal so that you can use it to carry out your 'worthwhile ideal.'
Success needs to cover many areas of your life: how you get on with other people and, just as importantly, how you get on with yourself. Do you love yourself? If you don't love yourself you can't love others. We can only give out what we've got. Success means you have to feel successful on the 'journey of life.' Working towards monetary wealth alone is likely to keep you striving thinking that you've never got quite enough.
But to get back to the school question. Educate yourself: read, write, seek experiences in the world. You will need to learn to read, and to write. But once you're 'literate' in that sense, whether you choose to become a conventional academic or simply one who is self-taught is entirely up to you. Both can help with your success. But the sustained effort required for success is entirely up to you.