first and foremost, you need to understand what makes a FICo score, once you do then you will understand what factiors are important ir order to improve your score.
So having said that, let's define the 3 most important factors of a FICO score which are: History, Balances and derrogatives. so how much history do you have with your current credit, how old is your credit, one year, two or three?? , next your balances should not exceed 30% of your credit limits, are they? and finally how many derrogatives do you have on your credit report?
Once you anwer these questions, you should have a clearer picture of where you stand when it comes to your FICO score.
I hope this helps!
Evelio Areas