SUBREDDIT: r/personalfinance
TITLE: Help with Student Loan strategy (ELI5?)
POST: Hi PF (Insert obligatory "Long time lurker/first time poster comment here).

I have been paying back student loans for a while and I got to thinking that I must be doing something inefficiently. They are as follows:

Loans I've been paying:
Vermont Student Assistance Corp - Subsidised Stafford at 6.8% with a $2,133 balance down from $3,500
Sallie Mae private at 9.25% with a $2,868 balance down from $3,500
Sallie Mae private at 8.75% with a $983 balance down from $2,000

Loans just entering repayment:
NelNet - Subsidised at 5.6% with a balance of $3,500
NelNet - Subsidised at 4.5$ with a balance of $4,500
NelNet - Subsidised at 3.4% with a balance of $11,000
NelNet - Unsibsidised at 6.8% with a balance of $25,500

Granite State Management and Resources - Parent Plus loan - Some where in the $10,000 range down from $20,000 (Monthly payment of $217; I've been paying this one for a few years)

My income:
$50,000 a year or $1,156 bi-weekly after tax, deductions, and savings (10% auto transferred into savings account each check). My (Non-loan) expenses are about $1,100 a month including rent, groceries, car insurance, phone, etc. I have no debts other than my student loans (I own my car and rent an apartment).

My Loan payments total up in the ballpark of $750 a month and there has to be a way to lower that number. I do pay at least double the minimum payments on the Sallie Mae and first subsidized loan. The Parent loan I don't have any information on as it is technically my fathers loan I am only an authorized payer on the account and cannot view any information; my dad has yet to send me the information.
TL;DR: 
50K in student loans, 50K in income. Read through the sidebar but need the ELI5. What's the most efficient way to pay them down? 