an alternative option, slightly more "sophisticated":
\documentclass{article}
\usepackage{longtable, % for case if table is longer than one page
makecell} % for columns headers
\renewcommand\theadfont{\normalsize\bfseries} % column header font definition
\usepackage{siunitx} % for S column type, numbers are aligned at decimal point
\begin{document}
\begin{center}
\begin{tabular}{lS[table-format=1.1]l}
\thead{Denomination} & {\thead{Scope\\ in weeks}} &\thead{Grade} \\
Native language, literature & 7 & 3 (rahuldav) \\
some topic & 0.5 & 3 (rahuldav) \\
Microprocessor engineering & 2.5 & 5 (viga hea)
\end{tabular}
\end{center}
in case if you need \verb+longtable+:
\begin{longtable}{lS[table-format=1.1]l}
\thead{Denomination} & {\thead{Scope\\ in weeks}} &\thead{Grade} \\
Native language, literature & 7 & 3 (rahuldav) \\
some topic & 0.5 & 3 (rahuldav) \\
Microprocessor engineering & 2.5 & 5 (viga hea)
\end{longtable}
\end{document}

addendum:
some people prefer if the column header are vertically aligned at theirs bottoms:

this cab be done with use of the \thead[b]{...} instead of \thead{...} in the first tables rows in above mwe (minimal working example):
\thead[b]{Denomination} & {\thead[b]{Scope\\ in weeks}} &\thead[b]{Grade} \\
alignis a math display you wanttabularhere, with\begin{tabular}{lr;}for the three columns, – David Carlisle May 04 '19 at 08:09longtablepackage. – leandriis May 04 '19 at 08:21
– flowian May 04 '19 at 08:51Extra alignment tab has been changed to \cr. [&\textbf{\small{Denomination}} \quad &]&sign. A MWE: `\documentclass{article} \begin{document}\begin{tabular}{lrl} \textbf{\small{Denomination}} &\textbf{\small{Scope in weeks}} &\textbf{\small{Grade}}\ Native language, literature &7 &3
\end{tabular} \end{document}`
– leandriis May 04 '19 at 08:57;in my first comment was supposed to be anlsorry. – David Carlisle May 04 '19 at 08:58