IGCSComputer Studies (0420)https://olevelcomputerscience.files.wordpress.com/2015/09/input-devices.pdfhttps://thecrashcourse.com/courses/computerscienceProgramming Sectionhttps://askpakchairul.files.wordpress.com/2012/01/0420_y12_sw_unit_5-programming-concepts.pdfhttps://www.cambridgeinternational.org/programmes-and-qualifications/cambridge-igcse-english-second-language-oral-endorsement-0510/https://www.cambridgeinternational.org/Images/414301-2020-2021-syllabus.pdfhttp://www.infosquares.com/readingcomprehension/esl-reading-comprehension1.htmlMathshttp://olevelmathematics.blogspot.com/2018/01/