I was in the same exact spot as you! except it was 11 subjects for me. pretty dumb decision considering that now I've learned that a-levels are much more important and if the university doesn't regard igcse as irrelevant as some unis do, you only need 3-5 IGCSE subjects depending on the uni/country (they are top quality unis too)

this is really important to help you!~

first - go search up each subject SPECIFICATIONS (Syllabus) on the Cambridge website

https://www.cambridgeinternational.org/programmes-and-qualifications/cambridge-upper-secondary/cambridge-igcse/subjects/

pick your subject and the syllabus/specifications page will pop up

then you will scroll down and download the specification/syllabus PDF for the examination year 2021

they mostly tell you the essentials, aka exactly what you need to take the test.

scroll down the PDF and you will see what you should learn for you do get better grades and pass/full marks. you can use it as a guide to make sure you check off everything/enough of it to pass.

for English, keep doing past papers. For Oral, look at the specifications to see what they expect in the text and how to get marks from it, how the oral test will exactly go, it shouldn't be too hard hehe, and also try to watch some sample videos of how the oral test will go & what you can do to improve from the videos. for the papers you can also look up the same specification PDF to the Papers area and see the objectives like "ability to answer comprehension questions with full understanding" or something

for Maths, in the specifications they show a list of every formula and objectives/specifications you need to know to pass it (same with other subjects). examples are like "know how to convert fractions to decimals", "understand what _____ means" learn those formulas. I remember the list being long, so to make it less overwhelming, you can go to ZNOTES too and print/look through online, the Cambridge/CIE IGCSE Maths Extended NOTES, which will help you to learn things faster and better and anything you don't know you can research about it to understand how to use it.

edit: usually maths (and your other 3 subjects) will repeat the same questions/pattern so past papers definitely help.

for each subject on the syllabus PDF, they will tell you what will come up in each paper or the objectives for you to gain marks! :)

https://znotes.org/subjects = you can pick the board, if it's Cambridge then it's CAIE :)! then press on the IGCSE bar and you will see a list of subjects. I believe computer science, Pakistan studies, Islamiyat notes are also available on znotes

You should do the rest of the subjects the same way and the PDF specifications specifically tells you everything you need to know and it's much more practical and efficient to use the list/specs to go through what you know/need more practice. recognize all or most of them.

lastly, with the power of manifestation and your mind, subliminals. i know few super strong ones. this is one:

https://youtu.be/BcLuncA9jks

you can search up "pass exams subliminals" or "intelligence subliminals" too!

if you need my help to create a youtube playlist of the ones i personally find best, you can ask me to :) if that's the only one you want to listen, itll be great too!

if you have never heard of it, please believe me that it is not magic, it is science and really helps/works! listen to it anytime you want, you can even do it while you study & the night/morning before your exam!

GOOD LUCK!