hi,

the syllabus for 11th standard science stream is designed for one year study. however in school there is half yearly pretest and test exam, so  usually it would take 9-10 month to fully cover the syllabus , however in between studies you have to make revision the completed lessons, make short notes, practice the mathematical problems and MCQ. careers360 has  jee main online coaching for students who are self preparing, this course includes mock exam, online video lectures, doubt solving sessions, previous years solved papers etc. follow the below link to know in details:

https://learn.careers360.com/jee-main-coaching/