How can I learn to trust in what I am doing?

So my O Level exam is in 63 days. I’ve been preparing, and so have my friends. In my mind the way I’m preparing is pretty good. But then my friends discuss their study plans and I get thrown off, wondering if I should do something more similar to what they’re doing, and if my plan is adequate or not. All this second guessing is driving me crazy and distracting me from my studying.
My plan is to make notes from the textbooks our school has set till mid-March, since I find writing things helps me remember them better. Then mid-March onwards I intend to learn from those notes, rote learn what I need to (I’m sitting for history and religious studies this year so there’s rote learning involved) and go through solved past papers and mark schemes to cover any information the textbook may have left out.
My friends are just rote learning straight from the textbooks our school has set, reading through reference books and going through past papers.
My method is more time consuming and involves a lot more work, but I find that this helps me. But because majority of my friends aren’t “wasting time” on notes, I’m wondering if I’m doing the wrong thing.
I know everyone has different methods of studying and retain information differently, and if I remove myself from what my friends say, I’m pretty happy with my plan.
But I’m second guessing myself now and I’ve already scared myself into a panic attack a while ago. I don’t want that to happen again and pull me away from my studies.
How can I learn to trust in what I’m doing?
(I’m so sorry for posting this actually, I’m really not sure what kind of answers I’m looking for. I guess I just want reassurance, so if you feel this is a silly thing to post, feel free to ignore it. Thanks in advance to anyone who chooses to answer :) ).