Taking my savings game to the next level

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I'm a full-time student at a (non specific) top-100 university, in a physics and math program. Age 20, male. Always managed high honours and numerous extracurriculars, volunteering, athletics, etc.. all that gay shit

During university, however, I worked anywhere from 2-5 part-time to full-time jobs, to both pay my tuition and better my financial life.

2.5 years ago, my net worth was -3.000$ (due to personal debt, and my family breaking apart).

As of today, my liquid cash savings are roughly 31,200$. I also have some physical emergency cash, and an amount of heirloom/scrap gold, silver, and gems. By the end of this fall semester, my net worth should be over 40,000$.

The problem is, my GPA has suffered. It looks like I'll graduate somewhere between a 3.1-3.5.

After this semester, I'm taking a break from school to either go into the army, or work full time, before transferring to another university (or just following through with this one).

I want to ask /biz/ how can I further accelerate my earning potential and net savings during this time. I have higher math skills than your average investor, but zero experience.

1) What high-paying jobs require few skills and training?

2) What are some secure investment strategies for a noob?

>inb4 permanent/golden butterfly portfolio
>inb4 cryptocurrencies