A level: (noun)- a qualification in a specific subject typically taken by school students in the UK aged 16–18, at a level above GCSE. The equivalent in Scotland is the Higher.

As of July $2021$, I am no longer an A-Level Student, which is a little sad. It is with greater regret that I will only be very slightly active on MSE for the next year (approximately), starting from August $2021$.

Thank you all for teaching me so many things, and I hope that I've helped some of you with my posts. Good luck and goodbye, until July $2022$.

List of useful integration techniques that aren't beyond high school level:

• What other tricks and techniques can I use in integration?

Some of my best/most interesting answers on this site:

• Proving $\sum_{k=-\infty}^{\infty}\frac{1}{64k^4+1}=\frac{\pi}{4}\frac{1+\mathrm{sinh}(\pi/2)}{\mathrm{cosh}(\pi/2)}$ without using residues or contour integrals
• Solving $3x^4+6x^3+x^2+6x+3=0$ exactly.
• Finding sum of the roots of $(\sin x+\cos x)^{(1+\sin 2x)}=2$
• How to calculate this trigonometric sum
• Prove this formula $\frac{1-r\cos(x)}{1-2r\cos(x)+r^2}= 1+\sum_{n=1}^{+\infty}r^{n}\cos\left(nx\right)$
• Evaluate $\sum\limits_{r=1}^\infty(-1)^{r+1}\frac{\cos(2r-1)x}{2r-1}$
• Solving $2^x+2^{-x}=2\cos\frac{x}{5}$
• Finding real $(x,y)$ solutions that satisfies a system of equation.

If you specifically want my help, then please email [email protected] with your problem. No guarantees though. :)