Econ 121 without Econ 100A or 101A or EEP 100

I am debating on which course to take. I have heard that Econ 121 is similar to the intermediate microeconomic theory courses which are full. Since Econ 121 is open, I might enroll in it instead of the other classes. I am planning to enroll in a MBA program, so I would like to have some exposure. I have taken Math 1A to Math 55. Thank you.

Take Econ 101A. Even if the waitlist is full, enough people will drop once they realise they have trouble with the math.