subfiles were a disaster

Doc/main.tex

@@ -1,15 +1,9 @@
 \documentclass[10pt]{article}
 \usepackage[english]{babel}
-\usepackage[
+% \usepackage[a4paper,top=2cm,bottom=2cm,left=2cm,right=2cm,marginparwidth=1.75cm]{geometry}
-  a4paper,
+\usepackage[a4paper, total={7in, 10in}]{geometry}
-  top=2cm,
-  bottom=2cm,
-  left=2cm,
-  right=2cm,
-  marginparwidth=1.75cm]{geometry}
 \usepackage{multicol}
 \usepackage{lipsum}
-\usepackage{subfiles}
 \usepackage{graphicx}
 
 \graphicspath{{images/}}
@@ -24,22 +18,32 @@
     Student Number: 1808444
   }
 
-
 \begin{document}
-
 \maketitle
-
 \begin{multicols}{2}
   \section{Introduction}
-    \subfile{sections/introduction.tex}
+    \lipsum[1-2]
+
+  \section{Circuit Description}
+    \lipsum[3-4]
 
   \section{Methodology}
-    \subfile{sections/methodology.tex}
+  To characterize the system, several tests have been performed. The 
+  characteristics of interest are the following:
+    \begin{enumerate}
+        \item Efficiency
+        \item Noise
+        \item Ripple characteristics
+        \item Transients
+    \end{enumerate}
+
+  Each of these characteristics have been tested at two different output voltages
+  and load currents. The different voltages are $7V$ and $3.3V$. The chosen load
+  currents are $10$, $20$, $30$, $40$ and $50 mA$. These values were chosen to 
+  give characterize the circuit over a broad range of conditions. 
 
 \section{Results}
-    \subfile{sections/results.tex}
 
 \section{Conclusion}
-    \subfile{sections/conclusion.tex}
 \end{multicols}
 \end{document}

Doc/sections/conclusion.tex

@@ -1,7 +0,0 @@
-\documentclass[../main.tex]{subfiles}
-
-\graphicspath{{\subfix{../images/}}}
-
-\begin{document}
-Hello world!
-\end{document}

Doc/sections/introduction.tex

@@ -1,7 +0,0 @@
-\documentclass[../main.tex]{subfiles}
-
-\graphicspath{{\subfix{../images/}}}
-
-\begin{document}
-Hello world!
-\end{document}

Doc/sections/methodology.tex

@@ -1,7 +0,0 @@
-\documentclass[../main.tex]{subfiles}
-
-\graphicspath{{\subfix{../images/}}}
-
-\begin{document}
-Hello world!
-\end{document}

Doc/sections/results.tex

@@ -1,7 +0,0 @@
-\documentclass[../main.tex]{subfiles}
-
-\graphicspath{{\subfix{../images/}}}
-
-\begin{document}
-Hello world!
-\end{document}