What basil said bassam said is kinda true, in that you can't just become Steven Hawking, but you can learn. Having knowledge is different to being smart. The definition of being smart is: having or showing a quick-witted intelligence. Having knowledge is... Well, knowing things. You can learn just about anything, but that doesn't mean you're smart. It just means you have a lot of knowledge.
You didn't define smart. If it is smart looks smart then sure. Just make yourself clean, tidy and get something formal to where. But if it is intelligent, well what are the boundaries. SMART IS OPPOSITE TO DUMB so you cannot be both. And we all know humans are pretty dumb, all of them. And what is smart?
No offence humans including me
Unlike the hippies and equalizers who believe everyone is equal and everybody can do what everyone else can, I believe that we are not all the same, some of us are better at stuff than we are. People are born with certain intelligence and it remains until the day you die. You can become more educated of course, by learning and eating up books and knowledge, but that doesn't define smart. Smart or intelligence is the innate ability to comprehend ideas at a more quicker and expressive rate than people of low IQs do. Some people aren't willing to hear something like this and will be outraged at the fact. But the truth is obvious, some people have better skills than everyone else. One person can be born with great artistic abilities, while some cannot even draw a stick figure by the age of 30. Some people are born with intelligence higher than the rest, and thus do better in school and analyze and interpret at a higher pace and rate. It it unfair? No, this is natural selection, we have to understand that we are like animals, we need to compete and fight for superiority. There will always be someone who is better than us, and someone who is lesser than us.
Some people, unfortunately, have inferior genes that produce dumb, weak, or otherwise, ineffective humans. (I know I'm going to get crap for saying this with people saying "all people are equal and beautiful blah blah blah" but I'm speaking from a scientific standpoint)
For those people, it is *literally* impossible for them to become intelligent. And there's also social pressure to think about.
Being smart sucks because dumb people hate it when people are smarter than them. (A lot of smart people do too, but in the scientific community there is still a sense of respect.) As such many smart people are brow-beaten to act dumber than they are. And the longer they pretend the more they become the thing they are pretending to be. Surrounding yourself with dumb people literally makes you dumber, and vice versa.
So to sum up....