Hello Ruchi,

Yes, they will repeat. Here is how we describe this on www.pm-exam-simulator.com :

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Simulator uses The Same Questions in all Three Modes

Please note that The PM Exam Simulator uses the same questions in all three modes.

For example, there are 650 questions in the simulator for those preparing for their CAPM Exam. This means if you first take 10 quizzes with 50 questions each you will go through 500 of the available 650 CAPM questions. And if you now take Exam 1, Exam 2 and Exam 3 in order (each containing 150 questions) you will see many of the same questions again.
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And I believe that there is even a small notice in the quizzes section about this. In this way, when you start a quiz you're being alerted to the fact that we use a single question pool.

If I take short (15-20 Questions) Timed and Learning quizzes, how the simulator pick them? Will they be repeated in my full length Mock exam?