Sstrhsrtj

I am writing an mcq book using book class. The main.tex is as under.

documentclass[12pt,a4paper]{book}

usepackage{amsmath,amsthm}

usepackage{ifthen,amsfonts,amssymb,dsfont}

usepackage{etoolbox,multicol}

documentclass[12pt,a4paper]{book}

usepackage{amsmath,amsthm}

usepackage{ifthen,amsfonts,amssymb,dsfont}

usepackage{etoolbox,multicol}

usepackage[english]{babel}

usepackage{blindtext}

usepackage{geometry}

usepackage{lmodern}

usepackage[T1]{fontenc}

usepackage{enumitem,kantlipsum}

usepackage[dvips]{graphicx,color}

usepackage{verbatim, pstricks,ulem}

usepackage{syntonly}

newcommand{newmatrix}[2]{left(begin{array}{#1}   #2end{array}right)}



newboxallanswerkeys

setboxallanswerkeys=vbox{}

newenvironment{answerkey}{%

globalsetboxallanswerkeys=vboxbgroup

unvboxallanswerkeys

}%

{%

bigbreak

egroup

}



newcommand{showallanswerkeys}{parunvboxallanswerkeys}



newcommand*{getanswerkeys}[6]{%

item[theenumi.]begin{answerkey}(#5)end{answerkey}

}



newboxallanswers

setboxallanswers=vbox{}



newenvironment{answer}{%

globalsetboxallanswers=vboxbgroup

unvboxallanswers

}%

{%

bigbreak

egroup

}



newcommand{showallanswers}{parunvboxallanswers}



newcommand*{getanswer}[6]{%

ifthenelse{equal{#6}{}}{}{

item[theenumi.]begin{answer}(#5)~#6end{answer}

}}



setlengthparindent{0pt}



newcommand{fourch}[6]{

par

begin{tabular}{*{4}{@{}p{0.23textwidth}}}

(a)~#1 & (b)~#2 & (c)~#3 & (d)~#4

end{tabular}

getanswer{#1}{#2}{#3}{#4}{#5}{#6}

getanswerkeys{#1}{#2}{#3}{#4}{#5}{#6}

}



newcommand{twoch}[6]{

par

begin{tabular}{*{2}{@{}p{0.46textwidth}}}

(a)~#1 & (b)~#2

end{tabular}

par%vspace{4pt}

begin{tabular}{*{2}{@{}p{0.46textwidth}}}

(c)~#3 & (d)~#4

end{tabular}

getanswer{#1}{#2}{#3}{#4}{#5}{#6}

getanswerkeys{#1}{#2}{#3}{#4}{#5}{#6}

}



newcommand{onech}[6]{

%par

begin{tabular}{@{}p{0.04textwidth}@{}p{0.91textwidth}}

(a) & #1

end{tabular}vspace{2pt}

begin{tabular}{@{}p{0.04textwidth}@{}p{0.91textwidth}}

(b) & #2

end{tabular}vspace{2pt}

begin{tabular}{@{}p{0.04textwidth}@{}p{0.91textwidth}}

(c) & #3

end{tabular}vspace{2pt}

begin{tabular}{@{}p{0.04textwidth}@{}p{0.91textwidth}}

(d) & #4

end{tabular}



getanswer{#1}{#2}{#3}{#4}{#5}{#6}

getanswerkeys{#1}{#2}{#3}{#4}{#5}{#6}

}



newlengthwidthcha

newlengthwidthchb

newlengthwidthchc

newlengthwidthchd

newlengthwidthch

newlengthtabmaxwidth



setlengthtabmaxwidth{0.96textwidth}

newlengthfourthtabwidth

setlengthfourthtabwidth{0.25textwidth}

newlengthhalftabwidth

setlengthhalftabwidth{0.5textwidth}



newcommand{choice}[6]{%

settowidthwidthcha{AM.#1}setlength{widthch}{widthcha}%

settowidthwidthchb{BM.#2}%

ifdimwidthch<widthchbrelaxsetlength{widthch}{widthchb}fi%

settowidthwidthchb{CM.#3}%

ifdimwidthch<widthchbrelaxsetlength{widthch}  {widthchb}fi%

settowidthwidthchb{DM.#4}%

ifdimwidthch<widthchbrelaxsetlength{widthch} {widthchb}fi%



ifdimwidthch>halftabwidth

onech{#1}{#2}{#3}{#4}{#5}{#6}

elseifdimwidthch<halftabwidth

ifdimwidthch>fourthtabwidth

twoch{#1}{#2}{#3}{#4}{#5}{#6}

else

fourch{#1}{#2}{#3}{#4}{#5}{#6}

fififi}



newcommand{mcq}[8]{

item #2

choice{#3}{#4}{#5}{#6}{#7}{#8}

}



defdatabaseone{

mcq{245}{Let $A$ be a symmetric matrix of order $n$ and $B$ be a skew-    symmetric matrix of order $n$. Then which one of the following is a skew-symmetric matrix?}{$A^{2}$}{$B^{2}$}{$AB+BA$}{$AB-BA$}{c}{}{}



mcq{248}{A square matrix is a diagonal matrix if and only if it is}{upper triangular}{lower triangular}{both upper triangular and lower triangular}{none of these}{c}{}{}



mcq{249}{Let $A$ be a non-singular matrix of order $3$. Then the rank of matrix $A^{2018}$ is}{$1$}{$2$}{$3$}{$9$}{c}{Note that $A^{2018}$ is a non-singular matrix of order $3$. Hence rank $(A^{2018})=3$.}{}



mcq{250}{If $A=newmatrix{ccc}{0 & 1 & 0\0 & 0 & 1\1 & 0 & 0}$, then rank of the matrix $A+A^{2}+A^{3}$ is}{$1$}{$2$}{$3$}{none of these}{a}{Note that $A+A^{2}+A^{3}=protectnewmatrix{ccc}{1 & 1 & 1\1 & 1 & 1\1 & 1 & 1}$. Hence rank $(A+A^{2}+A^{3})=1$}{}

}



begin{document}

chapter{One}

begin{enumerate}

databaseone 

end{enumerate}



bigskip

Huge{Answer Key:}

bigskip  



begin{center}

begin{multicols}{6}

showallanswerkeys 

end{multicols}

end{center}



bigskip

Huge{Hint/Explanation of Selected Problems:}

bigskipbigskip

showallanswers



chapter{Two}

begin{enumerate}

databaseone 

end{enumerate}



bigskip

Huge{Answer Key:}

bigskip  



begin{center}

begin{multicols}{6}

showallanswerkeys 

end{multicols}

end{center}



bigskip

Huge{Hint/Explanation of Selected Problems:}

bigskipbigskip

showallanswers

end{document}

When I run this code in overleaf the following strange output has been obtained.

Chapter two has different output than chapter one.

Please help me.

Many thanks in advance.

documentclass[12pt,a4paper]{book}

usepackage{amsmath,amsthm}

usepackage{ifthen,amsfonts,amssymb,dsfont}

usepackage{etoolbox,multicol}





%%NO!!! two documentclass documentclass[12pt,a4paper]{book}

%% NO already loaded usepackage{amsmath,amsthm}

%% NO already loaded usepackage{ifthen,amsfonts,amssymb,dsfont}

%% NO already loaded usepackage{etoolbox,multicol}

usepackage[english]{babel}



% not in areal document usepackage{blindtext}

usepackage{geometry}

usepackage{lmodern}

usepackage[T1]{fontenc}

usepackage{enumitem,

% not in a real documentkantlipsum

}

usepackage[

% NO dvips

]{graphicx,color}

usepackage{verbatim, pstricks,ulem}

%NO! This disables almost all of latex if you use it usepackage{syntonly}



% No use pmatrix from amsmath newcommand{newmatrix}[2]{left(begin{array}{#1}   #2end{array}right)}



newboxallanswerkeys

setboxallanswerkeys=vbox{}

newenvironment{answerkey}{%

globalsetboxallanswerkeys=vboxbgroup

unvboxallanswerkeys

}%

{%

bigbreak

egroup

}



newcommand{showallanswerkeys}{parunvboxallanswerkeys}



newcommand*{getanswerkeys}[6]{%

item[theenumi.]begin{answerkey}(#5)end{answerkey}

}



newboxallanswers

setboxallanswers=vbox{}



newenvironment{answer}{%

% OK but this is not colour safe, don't use colour in this environment

globalsetboxallanswers=vboxbgroup

unvboxallanswers

}%

{%

bigbreak

egroup

}



newcommand{showallanswers}{parunvboxallanswers}



newcommand*{getanswer}[6]{%

ifthenelse{equal{#6}{}}{}{

item[theenumi.]begin{answer}(#5)~#6end{answer}

}}



setlengthparindent{0pt}



newcommand{fourch}[6]{

par

begin{tabular}{*{4}{@{}p{0.23textwidth}}}

(a)~#1 & (b)~#2 & (c)~#3 & (d)~#4

end{tabular}

getanswer{#1}{#2}{#3}{#4}{#5}{#6}

getanswerkeys{#1}{#2}{#3}{#4}{#5}{#6}

}



newcommand{twoch}[6]{

par

begin{tabular}{*{2}{@{}p{0.46textwidth}}}

(a)~#1 & (b)~#2

end{tabular}

par%vspace{4pt}

begin{tabular}{*{2}{@{}p{0.46textwidth}}}

(c)~#3 & (d)~#4

end{tabular}

getanswer{#1}{#2}{#3}{#4}{#5}{#6}

getanswerkeys{#1}{#2}{#3}{#4}{#5}{#6}

}



newcommand{onech}[6]{

%par

begin{tabular}{@{}p{0.04textwidth}@{}p{0.91textwidth}}

(a) & #1

end{tabular}vspace{2pt}

begin{tabular}{@{}p{0.04textwidth}@{}p{0.91textwidth}}

(b) & #2

end{tabular}vspace{2pt}

begin{tabular}{@{}p{0.04textwidth}@{}p{0.91textwidth}}

(c) & #3

end{tabular}vspace{2pt}

begin{tabular}{@{}p{0.04textwidth}@{}p{0.91textwidth}}

(d) & #4

end{tabular}



getanswer{#1}{#2}{#3}{#4}{#5}{#6}

getanswerkeys{#1}{#2}{#3}{#4}{#5}{#6}

}



newlengthwidthcha

newlengthwidthchb

newlengthwidthchc

newlengthwidthchd

newlengthwidthch

newlengthtabmaxwidth



setlengthtabmaxwidth{0.96textwidth}

newlengthfourthtabwidth

setlengthfourthtabwidth{0.25textwidth}

newlengthhalftabwidth

setlengthhalftabwidth{0.5textwidth}



newcommand{choice}[6]{%

settowidthwidthcha{AM.#1}setlength{widthch}{widthcha}%

settowidthwidthchb{BM.#2}%

ifdimwidthch<widthchbrelaxsetlength{widthch}{widthchb}fi%

settowidthwidthchb{CM.#3}%

ifdimwidthch<widthchbrelaxsetlength{widthch}  {widthchb}fi%

settowidthwidthchb{DM.#4}%

ifdimwidthch<widthchbrelaxsetlength{widthch} {widthchb}fi%



ifdimwidthch>halftabwidth

onech{#1}{#2}{#3}{#4}{#5}{#6}

elseifdimwidthch<halftabwidth

ifdimwidthch>fourthtabwidth

twoch{#1}{#2}{#3}{#4}{#5}{#6}

else

fourch{#1}{#2}{#3}{#4}{#5}{#6}

fififi}



newcommand{mcq}[8]{

item #2

choice{#3}{#4}{#5}{#6}{#7}{#8}

}



defdatabaseone{

mcq{245}{Let $A$ be a symmetric matrix of order $n$ and $B$ be a

% no space in skew- symmetric

skew-symmetric matrix of order $n$. Then which one of the following is a skew-symmetric matrix?}{$A^{2}$}{$B^{2}$}{$AB+BA$}{$AB-BA$}{c}{}{}



mcq{248}{A square matrix is a diagonal matrix if and only if it is}{upper triangular}{lower triangular}{both upper triangular and lower triangular}{none of these}{c}{}{}



mcq{249}{Let $A$ be a non-singular matrix of order $3$. Then the rank of matrix $A^{2018}$ is}{$1$}{$2$}{$3$}{$9$}{c}{Note that $A^{2018}$ is a non-singular matrix of order $3$. Hence rank $(A^{2018})=3$.}{}



mcq{250}{If $A=begin{pmatrix}0 & 1 & 0\0 & 0 & 1\1 & 0 & 0end{pmatrix}$, then rank of the matrix $A+A^{2}+A^{3}$ is}{$1$}{$2$}{$3$}{none of these}{a}{Note that $A+A^{2}+A^{3}=protectbegin{pmatrix}1 & 1 & 1\1 & 1 & 1\1 & 1 & 1protectend{pmatrix}$. Hence rank $(A+A^{2}+A^{3})=1$}{}

}



begin{document}

chapter{One}

begin{enumerate}

databaseone 

end{enumerate}



%bigskip

% NO (this makes entire document Huge Huge{Answer Key:}

section*{Answer Key:}

%bigskip  



begin{center}

begin{multicols}{6}

showallanswerkeys 

end{multicols}

end{center}



%bigskip

%Huge

section*{Hint/Explanation of Selected Problems:}

%bigskipbigskip

showallanswers



chapter{Two}

begin{enumerate}

databaseone 

end{enumerate}



%bigskip

%Huge

section*{Answer Key:}

%bigskip  



begin{center}

begin{multicols}{6}

showallanswerkeys 

end{multicols}

end{center}



%bigskip

%Huge

section*{Hint/Explanation of Selected Problems:}

%bigskipbigskip

showallanswers

end{document}