MacBook Air randomly stopped starting ocassionally

I was really perplexed when two days ago my laptop wouldn't start after I ran it completely out of battery, however, I left it charging and it randomly turned back on the next morning. It had resumed exactly what I was doing when it shut down, I didn't even need to log it.

Today, my laptop ran out of battery again, and I again couldn't get it to turn on, so I left it charging and it randomly resumed where I left off, even playing the video that playing before. And I continued to use it for about an hour before I shut it down.

About an hour later I tried turning back on and it won't come on, I have charged it fully and it still remains off. I have exams this week and really need a laptop, and I have already sent my Torx set home as I pack up so I haven't been able to look inside the laptop. Every time it wouldn't boot I tried PRAM reset, SMC reset and holding control+option+delete+power which is something I found on here, all to no avail each time.