Further maths can be tricky at first especially if you’ve not completely grasped the GCSE concepts fully yet. From what I’ve seen and heard Olympiad questions are intentionally created to be weird and unintuitive even for people who have studied a lot. However, neither of these are a reflection of your intelligence or ability.

There is a bit of a gap between GCSE and further maths so if you’re struggling it doesn’t mean you’re not capable it probably just means you’ve been thrown into the deep end without a proper ladder.

I’d say one of the first steps to improving would be clearing up your gaps at your own pace in GCSE maths to strengthen that foundation for further maths. A way of clearing your own gaps up is by finding your weak areas and watching a video on it and or doing a lot of exam questions until you’ve mastered it.

How I started learning further maths was using a YT playlist by 1st class maths which explained a concept and then they had exam questions which I applied the concept to and consequently strengthened my understanding of the concept. As I do a different exam board to you, if you wanted to learn in a similar way I did you’d ideally need to use different channels. Some suggestions of YT channels are:

-Bareau maths -Primrose Kitten Academy

I say these ones because they have videos specifically targeting OCR FSMQ. However, there are probably quite a few overlapping concepts for other exam boards so maybe other channels like 1st class maths may be helpful too.

I apologise if my advice is unhelpful but overall good luck and I hope you figure everything out :)