These are two different concepts. While traditional schools generally focus on measuring intelligence, creativity is as important as intelligence if not more.
Intelligence gives you a base to find out something or take the understanding of a concept to the next level. On the other hand, creativity is significant as well because having sufficient knowledge about a concept is not enough. Being creative leads to new discoveries and opens a new horizon to think about a concept at a deeper level.
Standardized tests that schools expect students to take measures intelligence. The examinations do not test the divergent thinking of a person.
Just think about it. We all learn to write, speak and listen. There are always people better than you no matter how great you become. So what is the difference between the students studying in Oxford University and a student studying in a different region but is more creative as compared to them? While, a native English speaker might have a much more enhanced vocabulary, it is still possible that a non-native English speaker use the English words more effectively as compared to the native speaker. It is all about how creative you can get with the strengths that you have. We can also conclude that it is really our choices that define who we are, not our abilities.
A student who has graduated with a degree in English might be more capable than someone who does not have a degree in this field but various circumstances in life can lead him/her to stay unfocused and s/he might never fulfill his/her potential while the one who just enjoys writing might come up with ideas that cannot be taught by anyone; which comes naturally.
Intelligence is significant in that sense that it measures your aptitude for a particular field. Aptitude refers to a natural ability in a field. However, there is a relationship between both these concepts. Intelligence serves the bases for creativity. You learn concepts, understand them and memorize them. Your ability to learn and comprehend the meaning of concepts makes you intelligent. Given a new situation including new problems requires creativity. You have to use your previous knowledge and apply to the newly arisen problem. With intelligence alone, you can give solutions to the similar problems but in the case of a completely new problem you have to use the previous understanding.
The best example of I can think of is recess. Gretchen Grundler is what we can call an intelligent girl and she is certainly creative as well but why is she creative if she’s intelligent? The reason is it doesn’t necessarily means being intelligent means you’re not creative. However, being creative does not mean you need to have a high IQ like Gretchen Grundler. Now, if we look at the other character, that is, T.J. Detweiler, who is the prankster of the gang is not even near to being superiorly intelligent but is highly creative. Pranks require creativity and he is a top-notch prankster. Despite being intelligently average, he earns all the points in creativity. Therefore, being intelligent does not mean that one is highly creative and similarly being highly creative does not necessarily means that one has high IQ.