improving my drum technique

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i have playing drum for about 3 years now, but the problem is i still in the beginner status, there is not many technique that i know, i have problem to practice my drumming because i don't have a drum set!all this years i practice only once every two weeks at a rent studio because i dont have enough money, there is no improvisation in my drumming, can anyone please tell me how i can solve this problems..