If i get a D in AP Calc AB will i get revoked?

So i have about 3 weeks before finals and im sitting at a high solid D. if i end up getting a D will i get revoked? i applied to most of the uc's and csu lb and sd state.. errrghh im stressing out! what should i do? i did speak to my teacher about an extra credit opportunity but with one more test and a final left, my grade will go up if i get like an A or B on those and i highly doubt ill be able to get those grades being that ive been receiving d's and f's on the previous tests -__- during winter break i studied the previous chapters so much but its still so hard.. >< what can i do? and i cant afford to get a calculus tutor because they're all so expensive.. -__- please help..thank you!