After spend the whole 2013 looking for a job and do not get anyone, I decided to begin a Master's Degree full-time. Days later, after paying the Master... I got a full-time job ¬¬ So I spent the first semester of this year doing both things, I had no life but I successfully managed to end the first semester with an average A.
This second semester is tougher because it has the final project as well. I think I may keep doing both things, but reducing the quality of my master's tasks, so at the end probably I would end up with a B.
I'm really thinking of leaving my job to put 100% of my efforts on the Master and end up with an A (or maybe A+, although it's going to be tough as I got a course with C+ the first semester

).
What would you do?
a) Keep the job, obtain a B and get stressed as hell.
b) Leave the job and obtain A or A+.
The option b) sounds attractive from the perspective that I would be more marketable with a good score and a good project, but it has the drawback of not to get experience and money.