what’s the level of cambridge enrichment questions for y11 3u maths? asking bc i struggle with some of them, and i’m planning on doing 4u, so should this be a matter of concer?
Enrichment questions shouldn't be considered as "extension exercises", but rather motivation for further mathematics. When learning about integrating trig functions, you might have enrichment focusing on integrating the hyperbolic counterparts which isn't necessarily hard but rather supposed to "interest" you more in maths.
Some questions by nature will be extremely hard and they're supposed to be for people who want to go outside the syllabus requirements and study further. You might even see MX2 questions pop up in MX1 enrichments just to demonstrate.
Considering your context as someone starting out year 11 3u, don't worry about them and just focus on getting your bearings with 3u content. By al means go attempt them if you're finding 3u easy so far or you just want that extra challenge but do not consider them the benchmark for a top 3U student or someone wanting to pursue 4u.