brew cask install mactex
drawing cubes:
1. put a frame around the whole page, need two line:
\usepackage{fancybox}
\fancypage{\fbox}{}
https://www.cse.iitk.ac.in/users/ktiwari/resources/LatexCheatSheet.pdf
1. cone
https://tex.stackexchange.com/questions/28802/cut-off-cone-in-tikz?rq=1
cut-off cone not working; closest is
http://www.texample.net/tikz/examples/truncated-cone/
2.
https://artofproblemsolving.com/community/c68t1f68h302886_mathcounts_test_in_latex
Use twocolumn option in \documentclass and see section 9 of the fancybox manual for a frame for the whole page eg \fancypage{\fbox}{}
I've just told you how: \fancypage{\fbox}{}. fancybox.sty is included in all LaTeX distributions unless you have MiKTeX Basic in which case it will fetch and install it for you.
What has twocolumn got to do with font size; they are independent options? \documentclass[twocolumn,12pt]{article} will give two equal size columns and 12pt font size. If you want unequal columns then use a table with p{width} to give the size of each column.
1. the following gives blank in front of question, but not two columns; second line goes under blank.
\documentclass[12pt]{exam}
\renewcommand\questionlabel{\thequestion. \rule{2cm}{3pt}}
\begin{document}
\begin{questions}
\question He believed that matter consists of four elements of air, earth, water, and fire.
\end{questions}
\end{document}
2. put answerline in same line as question-
\documentclass[a4paper]{exam}
\usepackage{letltxmacro}% http://ctan.org/pkg/letltxmacro
\usepackage{xpatch}% http://ctan.org/pkg/etoolbox
\xpatchcmd{\answerline}% <cmd>
{\par\nobreak\vskip\answerskip}% <search>
{}% <replace>
{}{}% <success><failure>
\xpatchcmd{\answerline}{\fi \par}{\fi}{}{}% Remove line break after \answerline
\makeatletter
\LetLtxMacro{\oldanswerline}{\answerline}
\RenewDocumentCommand{\answerline}{s o}{%
\begingroup
\IfBooleanTF{#1}
{\def\@queslevel{\relax}}% \answerline*
{}% \answerline
\IfNoValueTF{#2}
{\oldanswerline[{}]}% \answerline
{\oldanswerline[#2]}% \answerline[..]
\endgroup
}
\makeatother
\begin{document}
\begin{questions}
\question \answerline[hello] what is a and b?
\question Write hello \answerline*[hello] to your mother
\question Write hello \answerline[hello] to your mother
\end{questions}
\end{document}
3.
mathcounts latex example aops forum - had to search
https://tex.stackexchange.com/questions/67303/customize-answerline-in-exam-class?rq=1
https://tex.stackexchange.com/questions/135754/align-part-questions-in-the-exam-class?rq=1
https://tex.stackexchange.com/questions/82152/answerline-to-the-right-of-a-question
https://artofproblemsolving.com/community/c68t1f68h302886_mathcounts_test_in_latex
https://artofproblemsolving.com/community/c68t1f68h107714_mathcounts_format
https://artofproblemsolving.com/community/c3h126233p715641
https://artofproblemsolving.com/wiki/index.php/Category:Asymptote
https://artofproblemsolving.com/wiki/index.php/Category:LaTeX
exam.cls for latex needed
http://www-math.mit.edu/~psh/#ExamCls
http://dsec.pku.edu.cn/~qjz/Tex/AoPS_L_GuideSym.php.html
https://monks.scranton.edu/past/math479/workouts/
https://usamts.org/Rules/U_RulesSubmitting.php
https://usamts.org/Tests/Problems_30_1.pdf
https://tex.stackexchange.com/questions/24285/alignment-of-material-across-pages