what subjects should i pick for igcse

i m planning to drop out of high school and use my remaining time to do self study at home without attending lesson or class. i plan to sit for next year igcse exam in may which i still have only 7 months left to prepare for it , i would like to pick 6 subjects which are business studies,math , chinese , english(first lang/second lang) , and i dont know what are some easy subjects for the remaining two subjects that im gonna pick , and does the highest grade i can achive is only C for a english as second language ? is it possible for me to learn and understand all the information of each subject in such short period of time by just studying at home, and still can achive good grades in the igcse exam ?