Hello,
You can study subjects free from online sources. Search for any content in browser you will get it.
You won't get a free online degree.
If you want to study as per syllabus the. You have to go by subjects and chapters.
You can choose unacademy, udemy. You can also search in YouTube. There are many online platforms . It will be better option if you search and find suitable one for you.
Hope it helps!