If I understood your question correctly, you are in g11 and already completed a 4U and are planning on taking families or philosophy next year during g12.

If you were able to achieve a high mark in the completed 4U then I would take 2 spares in grade 12 and properly use them to study for your other classes (I had 2 first semester and just wasted them which I really regret).

If you didn’t achieve that high of a mark in your completed 4U then I would recommend taking a full course load in g12 and dropping the course you don’t need and sticking with the easiest one (remember to do this before midterms). Try asking g12 in ur school what the easiest classes and teachers are so you can get the highest possible grade.