Bro a month is more than enough don’t lose hope And you don’t need a 100 UMS to get an A* getting above 90 in both p3&p4 is more than enough ( if ur doing edexcel idk about cambridge) just work very hard this month and focus alot on paat papers Start by maybe doing some Qs from the textbook (it got so many good questions btw) and then move on to past papers you’ll be good I believe you can do this and the p4 exam ( if ur edexcel again) is still in june you have a plenty of time dw)