Ways to raise my credit score


I currently have 3 credit cards, 


1. Amazon store card, which I actually never ended up using. $ 800

2. Citbank 500 limit, $ 370 used

3. Wells Fargo student $ 800


My question is. 

1. Should I use Amazon store card? will this help raise the credit score? I just use my citibank credit card for this

2. I am planning on paying back my debt of $ 370. Should I pay it all off? if not how much should I pay back ?

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