If you think you're not good enough to get it, then you won't get it. That much is guaranteed.
It's not about having brains from the start, it's about having confidence from the start.
Every one is born with different abilities in different areas, but there is less than we think separating us from the next person. The person who gets 100% on every test might look like a genius to every one else, but once you stop worshipping and start thinking in terms of "What's stopping me from doing that?", only then will you have the right frame of mind to get to where they are at.
And you have to truly believe that you can get to the top, because that person who gets 100% on every test believes that every day. If they didn't believe they could get to the top, then they wouldn't bother climbing. And the beauty is that everyone can get to the top, some people just don't bother trying.
I know this sounds like motivational bullshit but it is true