Hey!

Depending on the subjects you are currently studying, you can easily get lots of multiple choice questions to solve. Some sources can be:

• You can purchase relevant books available in market which contain solved and unsolved questions
• Browse "_____(name of subject) multiple choice question bank solved/unsolved"
• Download online education apps which have MCQs and quizzes available
• Some educational magazines do have sections in which they provide MCQs with detailed solutions

These are just few suggestions. You should try them out.

Hope it helps!