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Option 1(the free way): Pick what you are researching, and then play matches with the same type of vehicle(air to research air, ground to research ground). Getting kills is essential if you are going to make any sort of progress before the hat death of the universe.
Option 2(The not so free way): Pull out your credit card and swipe it for about 2-10 dollars per tank/plane.
Edit:
And the inbetween option, where you pay for premium to double your research gains.