Are there any books I should consider besides the ones needed for the course?

I'm wondering what electives I should choose and I'm asking for advice. I'm not sure if I should cut out two half courses and add Discrete mathematics and algebra. I suspect that Game theory and Optimisation theory are not what I'm looking for. I have one more question... After the exams I will have some time before I (hopefully) start my studies.
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Arthur:
I miss my step siblings?
(24 September 2016)

Arthur:
Is there any way I can cope with this?
(24 September 2016)

Arthur:
I m not allowed to be in contact with any of them.
(24 September 2016)

Arthur:
It s been 4 years and I still feel so sad.
(24 September 2016)

Arthur:
It feels as if they might as well have died.
(24 September 2016)

Arthur:
It felt like we d lived together my whole life, and that we were blood siblings.
(24 September 2016)

Arthur:
We had so much fun together and I truly loved them.
(24 September 2016)

Arthur:
Even though I only knew them for a year, it feels like an empty hole in my heart.
(24 September 2016)

Arthur:
I haven t seen any of my step siblings for four years and it still hurts so bad every day.
(24 September 2016)

Arthur:
We lived together for a year, but then my mom and stepdad divorced and we cut ties.
(24 September 2016)