How hard is Physical Oceanography

Hey lads! I just got my Oceanography degree and i have been so conflicted between what to follow. During my Bachelor's i experimented a lot with Lagrangian models for pollution and GIS and Remote Sensing. In general i seem to grasp better the more technical subjects during my Bachelor's and i struggled with the Physical Oceanography classes. But i actually really like Physics and through the models i experimented with i really got into the physics behind it and i also really want to get into the world of ROMS. So my question is : Is Physical Oceanography going to be a challenge for me to pursue for a masters? I do have gaps on my knowledge of math(not crazy though) and i barely passed the subjects in my Bachelor's. Thanks a lot in advance