\begin{longtable}[]{@{}
  >{\raggedright\arraybackslash}p{(\linewidth - 2\tabcolsep) * \real{0.5000}}
  >{\raggedright\arraybackslash}p{(\linewidth - 2\tabcolsep) * \real{0.5000}}@{}}
\caption{List of Students}\label{students}\tabularnewline
\toprule\noalign{}
\begin{minipage}[b]{\linewidth}\centering
Student ID
\end{minipage} & \begin{minipage}[b]{\linewidth}\centering
Name
\end{minipage} \\
\midrule\noalign{}
\endfirsthead
\toprule\noalign{}
\begin{minipage}[b]{\linewidth}\centering
Student ID
\end{minipage} & \begin{minipage}[b]{\linewidth}\centering
Name
\end{minipage} \\
\midrule\noalign{}
\endhead
\bottomrule\noalign{}
\endlastfoot
\multicolumn{2}{@{}>{\raggedright\arraybackslash}p{(\linewidth - 2\tabcolsep) * \real{1.0000} + 2\tabcolsep}@{}}{%
Computer Science} \\
3741255 & Jones, Martha \\
4077830 & Pierce, Benjamin \\
5151701 & Kirk, James \\
\multicolumn{2}{@{}>{\raggedright\arraybackslash}p{(\linewidth - 2\tabcolsep) * \real{1.0000} + 2\tabcolsep}@{}}{%
Russian Literature} \\
3971244 & Nim, Victor \\
\multicolumn{2}{@{}>{\raggedright\arraybackslash}p{(\linewidth - 2\tabcolsep) * \real{1.0000} + 2\tabcolsep}@{}}{%
Astrophysics} \\
4100332 & Petrov, Alexandra \\
4100332 & Toyota, Hiroko \\
\end{longtable}
