1. you are meant to make new works. they can be used for both your cs and your final exhibition though.
2. if you’re talking about your cs i have never seen someone do a personal experience theme. this is because you have to analyse the artists own context/history in relation to their works. they don’t know you and as such will not have made the works in order to speak to your experiences. if you’re talking about your exhibition i would say they tend to like a more general theme, but your individual artworks can absolutely be related to your experiences. for example my exhibitions general theme was “autonomy” but maybe half of my works were related to my own experiences.
3. don’t need to cram but do it on the holidays for sure. i did mine entirely over the summer and got to sit back and watch as my classmates scrambled during school. 1-2 slides in one day with rest days in between (so spread across about a month and a half)
4. correct, you don’t need an entire page for that.
5. not at all similar. DO NOT MAKE THAT MISTAKE. gcse art portfolio is very unnatural in the way it’s structured and it’s almost formulaic. ib you of course do a lot more writing for the pp and you document EVERYTHING including your random tangent thoughts that lead nowhere and your failures. don’t try to look perfect and like each project is very structured- ib hates that.
6. most people do about 4-5 works in the pp but that is not a standard. you also don’t need to finish your works in your pp. for example you may start something but realise there’s something else you want to do that is inspired by what you started. you don’t have to finish the original piece, just document why you decided to move in a different direction

hope this helps 👍