Hi Faizan,
It is great that you are looking to study. The Open University provides free courses on our OpenLearn website. There are a number of resources available to study for free, starting at any time. We offer some adapted extracts of Open University modules on our OpenLearn website:
https://www.open.edu/openlearn/
The following free course is an adapted extract from the OU's Introduction to Computing and IT module:
https://www.open.edu/openlearn/science-maths-technology/computing-ict/introducing-computing-and-it/content-section-0
FutureLearn is a website which provides free courses to study, similar to The Open University's OpenLearn. Modules can last between 2 - 8 weeks in length and can be used as a preparatory step before undertaking OU study:
https://www.futurelearn.com/subjects/it-and-computer-science-courses
You may also be interested in checking out the Khan Academy, which provides free study in specialist subjects. These topics can range from Computer programming to World History to Algebra. Here is a link to the courses they offer in Computing:
https://www.khanacademy.org/computing