A levels maths problems help!

Alright, so I just started doing my first year of a levels and from the results from my GCSEs, I'm happy that I was able to choose from a wide range if a levels.
Maths stood out for me because I enjoyed the element of problem solving to it. And from my GCSEs I got an A so I was confident that I would have a decent grade at the end of my first year.
I just want to note that I know that GCSEs are behind me and that they now mean nothing but in the first lesson I felt that everything was rushed, and I was forced to do revision in order to understand it.

I recently did a test for stats, core 1 & 2 and I did okay with stats getting a B in that area. But for core 1 & 2, I got 2 U grades.
Now I understand that this isn't the end if the world, it was only a test. But thing that got me was that I thought I had the grasp of everything that I did in lesson and from my revision after school, but there were questions on the topic which I haven't seen before. I might of been stupid and not look through the whole topic, but I felt like those healthy amount of hours have gone to waste.
This made me wonder if I should drop the subject and find another one because I don't want the same repetitive scenario to happen over and over again. I have a deadline on the 30th of September if I want to switch subjects.
P.s.
I'm doing the OCR exam board for AS level maths and in stats test they had histograms, for core 1 they had length of lines and perpendicular lines. Then for core 2 I had trigonometry (solving trig equations, sketching cos sin and tan x graphs) if you have any sources that are useful for maths revision sources, don't hesitate to share and thanks for spending time to read this


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in the first lesson I felt that everything was rushed, and I was forced to do revision in order to understand it.

The others in my core 1 mostly did the same, with about 3/4 of the class having U grades and 3/4 people who did alright in it

The others in my core 1 mostly did the same, with about 3/4 of the class having U grades and 3/4 people who did alright in it

Posted from TSR Mobile

That's what I thought, I didn't think I had an A at GCSE, but surprisingly I did. I guess that's the only way to through it, step the f up. Thing is, my maths core 1 & 2 book for the OCR exam board don't provide a clear on how to do some questions, is there any websites or YouTube videos that would help?

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And yesh, floorless logic on explaining how well my class did xD. What i was meant to say was that 75% got U in core 1 whole 25% got higher grades than a U

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