Carry along please...

Good day to you all, i have applied for f1 visa twice last year and I was denied tho I didn't get my i20 sign by my sponsor and my school didnt require a test for I meet up with the requirements, so I didn't write tofel or sat, I actually applied for undergraduate program, tho I have my 1st degree wish I didn't make it known in my ds-160 last year because I graduated with a third class, but my intention is to get another degree with a better result. I am about going back for the third time with the same university I applied initially, please I need your advise on how to come out success this third time.