Answer by Chandan Kharbanda for making a table fit on a page by moving it left

Simple answer : If you want to shift 6 em to the left you do something like

\hspace*{-6em}
\begin{tabular}{ m{5em}  m{14em}  m{17em}  m{4em} }
\hline  
\textbf{Year} & \textbf{Degree/Certificate} & \textbf{Institute} & \textbf{CGPA}
\end{tabular}