I have two questions on the following package combination of the MWE: First, how to shift part number/label while using tcolorbox?
\documentclass[a4paper,12pt]{exam} \usepackage{tikz} \usetikzlibrary{arrows,circuits.ee.IEC,positioning} \usetikzlibrary{decorations.markings} \usepackage[american voltages, american currents,siunitx]{circuitikz} \usepackage{graphicx,ctable,booktabs,float} \usepackage[most]{tcolorbox} \tcbuselibrary{skins,breakable} \usepackage[labelformat=simple]{subcaption} \usepackage{caption} \captionsetup[figure]{name=Fig.,font=footnotesize} \captionsetup[subfigure]{labelformat = parens, labelsep = space, font = footnotesize} \begin{document} \printanswers \unframedsolutions \begin{questions} \question For the network shown in Fig.~\ref{fig:2015q1a},\label{Q1}\par% \begin{minipage}[t]{0.5\textwidth} \begin{parts} \part Draw a complete graph.\label{2015q1a} \part Obtain a tie-set matrix by selecting a tree of your choice from the graph of (\ref{2015q1a}). \part Determine a cut-set matrix by selecting another tree from the graph of (\ref{2015q1a}). \end{parts} \end{minipage} \begin{minipage}[t]{0.5\textwidth} \vspace{-2.5em}% \centering% \scalebox{0.7}{% \begin{tikzpicture}[circuit ee IEC, x=3.5cm, y=3.5cm] \draw (1.6,0) to (0,0.0) to [V, l=5<\volt>] (0,1.0); \draw (0.0,1.0) to [R,l=47<\kilo\ohm>,*-*] (0.8,1.0); \draw (0.8,0) to [C,l=247<\mu\farad>,*-*] (0.8,1.0); \draw (0.8,1.0) to [cV, l_=$0.7\color{black}{i_x}$,-*] (1.6,1.0); \draw (1.6,0.0) to [R,l_=1<\kilo\ohm>] (1.6,1.0); \draw (0,1.0) to (0,1.4) to [L, l=2.5<\milli\henry>] (1.6,1.4) to (1.6,1.0); \draw[black,-stealth] (1.3,1.45) to node[above]{$i_x$} (1.45,1.45); \end{tikzpicture} }% end of scalebox \captionof{figure}{} \label{fig:2015q1a} \end{minipage} % ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ % ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ \setcounter{figure}{0} %<<>><<>><<>> \setcounter{equation}{0} %<<>><<>><<>> \renewcommand{\thefigure}{\thequestion(\roman{figure})} %<<>><<>><<>> \renewcommand{\theequation}{\thequestion.\arabic{equation}} %<<>><<>><<>> % ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ \begin{solution} \begin{parts} % ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ % ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ \part % - -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- \begin{tcolorbox}[enhanced, frame style={left color=black!5,right color=black!35,middle color=black!5!pink}, interior style={left color=green!10!white, right color=gray!10!white}, boxrule=1pt, sharpish corners, top=4pt, bottom=5pt, left=0pt, right=0pt] % - -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- - Given circuit is redrawn and a complete directed graph is obtained from it: % ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ % ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ \begin{figure}[H] \centering% \begin{subfigure}[t]{0.4\textwidth} \centering% \scalebox{0.6}{% \begin{tikzpicture}[circuit ee IEC,x=2.5cm,y=2.5cm,semithick,every info/.style={font=\normalsize}] \coordinate [label=left:\textcolor{blue}{$1$}] (A) at (0.0,1.6); \coordinate [label=\textcolor{blue}{$2$}] (B) at (1.0,1.5); \coordinate [label=below:\textcolor{blue}{4}] (C) at (1.0,0.0); \coordinate [label=right:\textcolor{blue}{$3$}] (D) at (2.0,1.6); \draw (1.0,0.0) to [V, l=9<\volt>,*-*,label/align=straight] (0.0,1.5); \draw (1.0,0.0) to (1.0,0.5) to [R, l=5<\kilo\ohm>,label/align=straight] (1.0,1.5); \draw (1.0,0.0) to [resistor, l_=7<\kilo\ohm>,*-*,label/align=straight] (2.0,1.5); \draw (0.0,1.5) to [cV,l=0.4$i_x$,label/align=straight] (1.0,1.5); \draw (1.0,1.5) to [resistor, l=2<\kilo\ohm>, *-] (2.0,1.5); \draw (2.0,1.5) to [bend right=25] (1.2,2.3) to [R,l_=2.5<\kilo\ohm>] (0.8,2.3) to [bend right=25] (0.0,1.5); \draw [->] (1.1,1.3) to node[below]{$i_x$} (1.4,1.3); \end{tikzpicture} } \caption{Given circuit is redrawn.} \label{SFQ1a1} \end{subfigure} \quad% \begin{subfigure}[t]{0.4\textwidth} \centering% \scalebox{0.6}{% \begin{tikzpicture}[decoration={markings, mark=at position 0.57 with {\arrow[scale=2]{latex'}}},font=\large] \coordinate [label=left:\textcolor{blue}{$1$}] (A) at (0.1,3.8); \coordinate [label=above:\textcolor{blue}{$2$}] (B) at (2.5,3.8); \coordinate [label=right:\textcolor{blue}{$3$}] (C) at (4.8,3.8); \coordinate [label=below:\textcolor{blue}{$4$}] (D) at (2.5,-0.15); \draw[postaction={decorate},thick] (0.1,3.72) to [bend right=-50] node[above] {$a$} (4.8,3.8); \draw[postaction={decorate},thick] (0.2,3.8) to node[above] {$b$} (2.5,3.8); \draw[postaction={decorate},thick] (2.5,3.8) to node[above] {$c$} (4.8,3.8); \draw[postaction={decorate},thick,*-*] (2.55,-0.25) to node[left] {$d$} (0.1,3.85); \draw[postaction={decorate},thick,*-] (2.5,3.88) to node[right] {$e$} (2.5,-0.2); \draw[postaction={decorate},thick,*-] (4.8,3.88) to node[right] {$f$} (2.5,-0.2); \end{tikzpicture} }%end of scalebox \caption{Complete directed graph of \subref{SFQ1a1}.} \label{SFQ1a2} \end{subfigure} \caption{Construction of graph from the given electrical circuit.} \label{fig:Q1a} \end{figure} % ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ \end{tcolorbox} \part A tree with twigs, $twigs$:\{b,c,e\}, has been selected by solid lines while links dashed lines in the graphs of Fig.~\ref{fig:Q1a}\subref{SFQ1a2}.% \end{parts} \end{solution} \end{questions} \end{document} Secondly, question is to how to enclose with parenthesis in subfigure reference? Reference output: 
Can anybody help me please?
box align=top, however not perfect