Is it possible to go down from PSAT to SAT in scores?

Hi! So I got a 1320 on my PSAT in October. I’m really aiming for the 1400s if at all possible on my SAT this week. However, I’m really worried that I’m going to go down in score. It doesn’t make sense to me why I would, but my Kahn Academy practice tests have made me nervous. I did 60 points better on math on my first practice test but 100 points worse on English & Reading when compared to my PSAT. I then decided to take one again today, and I ended up doing significantly better in the reading versus yesterday, but was still about 50 points below my PSAT score in reading. For math, my mind just blanked and I couldn’t even do it so I stopped the test. It doesn’t make sense why my scores would go down, as I’ve been in the most rigorous math course of my life this year and it has made me visibly better at math. Furthermore, I’m doing very well in it, and its a very hard course, so I feel like I should do at least 50 points better on the Math section. Further, I don’t understand WHY my Reading & Writing scores would drop at all. We’ve done AP Lang Exam practice MC in class, so I haven’t been away from it, and I’ve done pretty well on them. Is it possible that taking the exam on the computer in a non testing environment at home is playing a role? Is it possible that my skills have surprisingly weakened that much and my SAT will drop from PSAT? I really don’t know what to do, but I am now pretty nervous.

I think it is possible to go down in scores. My son got a perfect score on PSAT math, 760/760, but only a 750/800 in the SAT. Still a good score, but not a perfect score. In English I think he got 710/760 in PSAT and only 670/800 in SAT.