Study the subjects
Well it depends...Smart in which subjects?And what job?
There is street smart and book smart. Some people are very good at school subjects but hopeless in real life. It is good to have some of each type of smart.
to be really smart with knowledge of the world and school related subjects
smart A polymath is someone who excels in many subjects
Artists choose their subjects for reasons seldom known to others.
Because engineers are smart and they enjoy their subjects
Of course she is, she is one of a kind. She is on top of all her subjects right now and continuing to stay like that.
Study hard, eat healthy, get at least 8 hours of sleep, exercise, and it doesn't hurt to hang around smart people sometimes! Also, try to get smart people to help you in subjects you have trouble with.
Hmmm, this is a tricky one. Start by learning the language you wish to converse in correctly. When you have mastered it, you need to study lots and lots of subjects at school. Find some you like and d some exams. Then do some more. Then you will be a smart boy. But only if you are a boy, of course. Girls cannot be smart boys.
Marginally
There are many smart people on Answers.com. Many specialise in certain subjects or areas. No matter what subject you choose there is likely to be someone who is an expert in the field of study.
a book of math, reading ,science or any more subjects and throw a suprise party about ima genius