Good luck Aynur. For me it was over 25 years since I’d last sat an exam and to say I was terrified is mild. Get hold of past papers and work through questions on the variety of topics. Try and remember key names/dates with whatever method works for you. I had a great study buddy and we discussed each area at length, used mind maps and revision cards. For me part of the issue was also timing and sitting a 3 hour exam. Do some timed practice mocks and work out how long you can spend on each question. Also look ay the examiner reports as they are really helpful. Marks can often be lost for missing the most obvious. Set planned revision time - whatever works for you. I had the luxury of 2 whole days for each exam (spread out) and used them productively. If you have a case study do some research so that you can include current data. Finally RTQ - read the question. You’d be amazed at how easy it can be to misinterpret.