\section{Required Resources}
\begin{table}[ht!]
\begin{center}
\begin{tabular}{|p{3cm}|p{6cm}|p{5.5cm}|}
\hline
Sr.No. & Equipment & Availaibility \\ [0.5ex]
\hline\hline
1 & Arduino UNO & Yes \\
\hline
2 & Flex Sensors & Yes \\
\hline
3 & ZigBee Module & No \\
\hline
4 & Servomotors & Yes \\
\hline
\end{tabular}
\caption{Required Resources}
\label{tab:Required Resources}
\end{center}
\end{table}
\section{Milestones and Time Division}
\subsection{Seventh Semester}
\begin{table}[!]
\begin{center}
\begin{tabular}{|p{2cm}|p{7cm}|p{3cm}|}
\hline
Sr.No. & Milestones & Duration(Weeks) \\ [0.5ex]
\hline\hline
1 & Project Allocation and Confirmation & 01 \\
\hline
2 & Collecting relevant data for the project & 02 \\
\hline
3 & Understanding the project and literature review & 04 \\
\hline
4 & Project Definition Document & 02 \\
\hline
5 & Understanding the software which is used for the working of robotic arm & 04 \\
\hline
6 & Preparation of the presentation to be delivered at the end of the semester & 03 \\
\hline
\end{tabular}
\caption{Milestones in Seventh Semester}
\label{tab:Milestones in Seventh Semester}
\end{center}
\end{table}
\subsection{Eighth Semester}
\begin{table}[t]
\begin{center}
\begin{tabular}{|p{2cm}|p{7cm}|p{3cm}|}
\hline
Sr.No. & Milestones & Duration(Weeks) \\ [0.5ex]
\hline\hline
1 &Learn to have full control on the robot & 03 \\
\hline
2 & Understanding the software which is used to make the robotic arm as wireless & 03 \\
\hline
3 & Midsemester Exam & 01 \\
\hline
4 & Hardware implementation of module on the robotic arm to make it wireless & 03 \\
\hline
5 & Trials and validation & 01 \\
\hline
6 & Improvements if required & 01 \\
\hline
\hline
7 & End semester presentation & 03 \\
\hline
\end{tabular}
\caption{Milestones in Eighth Semester}
\label{tab:Milestones in Eighth Semester}
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Since you do not provide an MWE, I can only guess what might have gone wrong. You probably want to change the order of \caption{...} and \end{center}.
\documentclass{article}
\begin{document}
\section{Required Resources}
\begin{table}[ht!]
\begin{center}
\begin{tabular}{|p{3cm}|p{6cm}|p{5.5cm}|}
\hline
Sr.No. & Equipment & Availaibility \\ [0.5ex]
\hline\hline
1 & Arduino UNO & Yes \\
\hline
2 & Flex Sensors & Yes \\
\hline
3 & ZigBee Module & No \\
\hline
4 & Servomotors & Yes \\
\hline
\end{tabular}
\end{center}
\caption{Required Resources}
\label{tab:Required Resources}
\end{table}
\section{Milestones and Time Division}
\subsection{Seventh Semester}
\begin{table}[!]
\begin{center}
\begin{tabular}{|p{2cm}|p{7cm}|p{3cm}|}
\hline
Sr.No. & Milestones & Duration(Weeks) \\ [0.5ex]
\hline\hline
1 & Project Allocation and Confirmation & 01 \\
\hline
2 & Collecting relevant data for the project & 02 \\
\hline
3 & Understanding the project and literature review & 04 \\
\hline
4 & Project Definition Document & 02 \\
\hline
5 & Understanding the software which is used for the working of robotic arm & 04 \\
\hline
6 & Preparation of the presentation to be delivered at the end of the semester & 03 \\
\hline
\end{tabular}
\end{center}
\caption{Milestones in Seventh Semester}
\label{tab:Milestones in Seventh Semester}
\end{table}
\subsection{Eighth Semester}
\begin{table}[t]
\begin{center}
\begin{tabular}{|p{2cm}|p{7cm}|p{3cm}|}
\hline
Sr.No. & Milestones & Duration(Weeks) \\ [0.5ex]
\hline\hline
1 &Learn to have full control on the robot & 03 \\
\hline
2 & Understanding the software which is used to make the robotic arm as wireless & 03 \\
\hline
3 & Midsemester Exam & 01 \\
\hline
4 & Hardware implementation of module on the robotic arm to make it wireless & 03 \\
\hline
5 & Trials and validation & 01 \\
\hline
6 & Improvements if required & 01 \\
\hline
\hline
7 & End semester presentation & 03 \\
\hline
\end{tabular}
\end{center}
\caption{Milestones in Eighth Semester}
\label{tab:Milestones in Eighth Semester}
\end{table}
\end{document}
And/or, as @Werner says, you may want to replace the center environments by a \centering before \begin{tabular}. This will reduce the space between the tables and the rest.
\begin{center}instead of\centering? – Werner Jan 02 '18 at 18:05