\documentclass{article}
\usepackage{pdfpages}
\begin{document}
%\includepdf[pages=3]{S0.pdf}
\includepdf[pages={1-},angle=0,landscape]{L1.pdf}
%rotateoversize
\includepdf[pages={1-}]{L1classnotes.pdf}
\includepdf[pages={1-},angle=0,landscape]{L2.pdf}
%rotateoversize
\includepdf[pages={1-}]{L2classnotes20170113.pdf}
\includepdf[pages={1-},angle=0,landscape]{L3.pdf}
%rotateoversize
\includepdf[pages={1-4,6-}]{L3classnotes20170117.pdf}
\includepdf[pages={1-},landscape]{Part1Aquiz2017.pdf}

\includepdf[pages={1-},angle=0,landscape]{L4.pdf}
%rotateoversize
\includepdf[pages={1-}]{L4classnotes20170120.pdf}
\includepdf[pages={1-},angle=0,landscape]{L5.pdf}
%rotateoversize
\includepdf[pages={1-}]{L5classnotes20170124.pdf}
\includepdf[pages={1-},angle=0,landscape]{L6.pdf}
%rotateoversize
\includepdf[pages={1-3}]{L6classnotes20170127.pdf}
\includepdf[pages={1-}]{ProofMeanS.pdf}
\includepdf[pages={4}]{L6classnotes20170127.pdf}
\includepdf[pages={1-}]{ProofTraceFormula.pdf}
\includepdf[pages={5-}]{L6classnotes20170127.pdf}
\includepdf[pages={1-},landscape]{Part1Bquiz2017.pdf}

\end{document}
