I am really struggling with A-Level Maths (Mechanics)

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suvat is a generalisation of gcse speed-distance-time but now covers the case where acceleration is constant / non-zero. First thing to make sure you understand is how displacement - velocity - acceleration (force) are related in terms of basic calculus, graphs, examples so you can do simple thought experiments, ... Similarly how distance travelled is related to displacement and also for speed and velocity.

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Youve met two of the equations in gcse physics so v = u + at as its a simple definition of (constant) accelertion a = (v-u)/t and change in momentum so mv-mu = mat where the force is ma. Youve also met v^2 = u^2 + 2as as its effectively just the change in KE is work done so 1/2 mv^2 - 1/2 mu^2 = mas. The other 3 suvat equations you now know can be derived from these in a couple of lines as there are 5 suvat terms and 5 equations, each of which involves 4 variables so each one eliminates one of the suvat variables

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Simple questions say youre given 3 varaibles and have to work out the 4th using the appropriate equation. It helps to sketch the scenario or velocity-time graph or ... and clearly write down the suvat = values and choose the appropriate equation to get what you want. The equations are linear or quadratic, so its basic gcse stuff to solve them.

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More complex questions may involve two bodies, or two suvat phases or ... but the previous comments about sketching the info, writing down the suvat variables and equations and ... still apply. You typically use simultaneous equations to write down and solve each suvat phase/body