[NumCS] Add notes on exam

semester3/numcs/parts/07_exam/00_intro.tex

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+A few example questions that might show up in the exam are:
+\begin{itemize}
+    \item Reused homework tasks from the Moodle Quizzes and Code Expert (e.g. the GPS task)
+    \item Reused tasks from the mock exam
+    \item Doing quadrature on an $\arctan$ function, for which you have to use Gauss-Newton quadrature
+\end{itemize}
+Knowing \texttt{sympy} and having read through the docs of it (at least partially) can help tremendously.
+Additionally, try to use the script with a horrible (i.e. slow and not context-aware (i.e. it start search from the start)) to get used to that.
+You can get such a search function in a PDF reader by installing Firefox ESR 72 (on which to my knowledge, Safe Exam Browser is based).
+
+For the multiple-choice tasks, if applicable, use properties of the formulas
+(e.g. for the Radau quadrature, use the fact that one of the edges of the interval has to be included and the weight computation is different for it)
+or otherwise use the Jupyter notebook to run functions that are already implemented in the script, or better yet, \texttt{sympy}.