Assalamo alaikom bro!
I didn't opt for Maths but I have studied NA in my Engineering. It's very easy for an Engineer. It would take your 3 to 4 days only. Don't know about the extent of NA in CSS maths but don't worry, it's even easier than Linear Algebra in my view.
PS: I may not help you further as I haven't opted for this subject. Apologizing!
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"Whomever Allah guides, no one can misguide, and whomever Allah misguides, no one can guide." Al-Qura'an.
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