Assalamu 'Alaikum, Sister.
Regarding the field of study you picked, if you have any interest in science and/or healthcare (I'll assume you do, or else you'd have probably picked something else), you'll be fine if you put in the effort. It isn't necessarily an easy field, but entirely doable if you put the work in. Take notes, study, in put the information in as many ways as you can (listen to the lecture and write notes, read the readings and power points, rewrite the info in your own words, watch Youtube videos on the subjects, etc... the more methods of input you get, the more likely the information will stick), and while cramming can sometimes help, try to study regularly instead of just the last minute. A problem I had for certain subjects is learning for the test vs fully learning the material. Be sure to try and actually learn the info, and not just save it for the test and forget it.
You should also figure out your priorities if you haven't; school or social life, because there will be times where one may suffer for the sake of the other. So know what matters to you.
And I don't know the UK education system set up, so I'm not sure how close or far from uni you are based on your post, but still, no matter how much time you have, look ahead to what courses and material you'll be covering at uni and start reading up on it now.
And of course, ask Allah Subhanahu Wa Ta'ala for easy going in your courses, and for easy learning of the material. Just be sure to still put in the effort.
Ultimately, you'll be fine if you take it seriously and give it the time the material will likely demand.