Hey! I'm a Year 11 student who's going to sit her second history mock of the year next week. Personally, history was one of my weakest subjects during year 10 because I simply just found it hard to explain stuff in depth. The one day, my teacher gave this speech of how English and history are literally the same thing. if I can explain the symbolism of, I don't know, a full stop in a poem then I can explain things in history too.
First, I would suggest to go through all of the past papers and do them under timed conditions. Then I would search up practice questions online. For example, "medicine through time history [insert exam board] practice questions". This would help you with pacing yourself and also exposing yourself to as many questions as possible. Also, don't forget to ask your teacher for exam questions too.
Second, start making flash cards or posters on everything you've learnt so far. I revise my flashcards every day during exam season and I stick my posters on the wall so when I walk past it, I can quickly test myself.
I'm not familiar with medicine through time since I don't do that, but I would suggest making a list of every single important event and then working out the causes, what it is, and consequences of all of those topics. You can create knowledge organisers to sort all of the topics out. Also ask your teacher for any extra revision materials. My teacher gave me sheets and sheets of resources for my mocks at the end of year 10 that had mind maps, tables, checklists and more.
People say that history is too hard because you have to remember too many dates and its too much writing, but once you know how to effectively revise, it gets easier.
I hope you do well on your exam and good luck for the rest of your secondary career!