LSAT prep questions

Hi, 

I've been using the KA LSAT prep. I set up my study schedule, and I am doing the stages leading up to each of the practice tests. I am doing the stages on a daily basis, and so far am going through the course quite quickly. I want to complete more than one practice test a week. 1-2 per week is my goal. The LSAT I am writing is 13 weeks away (so a minimum of 26 tests). 

Oftentimes, I select the option to "practice similar questions again" when I complete a problem set. 

I know the questions are being pulled from previous LSAT's (to the best of my knowledge). I am concerned that if I continue to practice this way, I may run out of questions, and may not have enough questions for all of the practice tests. 

Is this a plausible situation, i.e. will I run out of questions, or should I continue doing the problem sets and add more practice sets as I feel best suits me? 

Some guidance would be appreciated. 

Thanks.