Best return by December to raise class grade 15%

So as the title says in my investing in securities class I have the opportunity to raise my grade 15% if you have a top 3 return by the end of the semester. We are using a program called stocktrack and each have 1 million in cash and 2 million in buying power. We can buy stocks, bonds, ETFs etc. The issue is I barely know what I'm doing. Learning as I go but curious if you guys have any tips or strategies??

Any help is appreciated. Thanks!