In GO site some feature are supported more and this is also required for making the GO PDFs look nice. Main one here is Latex which can be accessed from the "fx" button in the toolbar or if you are already familiar with it (most Good colleges do follow Latex) then you can simply type latex content with in \$\$. Some other points are
 Do not use subscriptsuperscript option. This is only for naive users. Others can use Latex like \$x_n\$ or \$x^n\$ which will be rendered as $x_n$ and $x^n$ respectively.

For images you can take screenshot of the actual source or draw in PowerPoint and upload them. For graphs (for DFA and others) you can use this site.

For tables, there is a Table option in editor. Table border can be hidden by Rightclick on the created table  Properties and then make Border 0.

Never use space for aligning  instead use Tables.

Never user subscript/superscript  they are for naive users. Instead type \$x_2\$,\$x^2\$ which will render as $x_2$ and $x^2$ respectively. These are latex commands and render nicely. For multiple chars do with {} like \$x_{small}\$.

For equations also use latex. There is fx button in the editor which is useful if you do not know Latex commands.

For options (A, B, C, D) in MCQs, use numbered lists and then right click> Properties > select Upper Alpha Style.

Even for any other lists either use the Bulleted List or Numbered Lists from the Editor.

Use fx for whole equation and not just for symbols  i.e., use like $n^{th}$ and not n$^{th}.

In fx \sin, \cos, \min, \max etc. are to be used for math function names.

In fx, to get space we can do \; or type inside \text{my text}. But use this only when strictly needed.

Anything between $$ is taken as equation (fx). So, to type \$, do enter \\.$

For C and SQL codes one can use the <> option in the Editor. It supports alignment with tabs and does syntax highlight. After selecting a tab size please use CTRL+Z to restore the previous alignment.

Install Grammarly browser plugin to ensure your sentences are grammatically correct.

To align equations using Latex you can also use \ begin{align} ... \end{align} environment inside \$\$ or \$\$\$\$ and align using '&'. For example:
\$\$ \ begin{align} \text{Total} &= n + (n 1) + (n  2) + (n  2) +\cdots+ 1\\&= \frac{n(n+1)}{2}\end{align}\$\$
will be rendered as $$\begin{align} \text{Total} &= n + (n 1) + (n  2) + (n  2) +\cdots+ 1\\&= \frac{n(n+1)}{2}\end{align}$$
In GATE Overflow we make use of MathJax library for Latex. So we do not have the full feature of Latex, but it supports whatever we need. You can see here for more nice Latex options.
For quick start to learn Latex completely any do your reports and thesis in Latex, please see https://www.sharelatex.com/learn/Learn_LaTeX_in_30_minutes