I've been using my twin sisters driving license for more than a year now
Why are you using her license instead of your own?
I'm afraid I won't pass the test and get my license.
The ability to get around is important but you should not use her license. You could both get into trouble if you get caught.
I don't care if she gets in trouble as long as I get off.
I understand that you want to be able to drive around, and it's normal to be anxious about taking a driving test. However, even if you do fail it, they let you take it multiple times until you pass. Instead of doing something that can get both of you in trouble, I think you should study and take the test to get your own license.