You'd need a 3000×2400 image, which is 7.2MP. The calculation is quite simple. DPI means dots per INCH. You want a print 10 INCHes wide, so for 300 dots per inch, you need 300×10 dots, or 3000.
So you can "up-size" (interpolate) to get your 300dpi, or you can leave the images alone and print with what you have. A 3mpxl image will normally make a very decent 8X10. If you need to print larger, a 5 MPXL image will work well, up to, double that size (16X20).
Writing down your grades after each test gives you an accurate and recent set of data to consistently look at and monitor. Whether you progress or degrees, you are still monitoring the data.
