I have come across one app named "nodia" it is best for preparation of mcq for 10 class
But edurev is best..

Assertion-Reason Questions for Class 10 English
Assertion-Reason questions are an integral part of the new CBSE pattern for Class 10 English. These questions assess a student's understanding of concepts and their ability to connect assertions with logical reasoning.
What are Assertion-Reason Questions?
- Assertion-Reason questions consist of two statements: an assertion (A) and a reason (R).
- The goal is to determine whether both statements are true and whether the reason correctly explains the assertion.
Structure of Assertion-Reason Questions
- Assertion (A): A statement that presents a fact or opinion.
- Reason (R): A statement that provides justification or explanation for the assertion.
- Students must evaluate the truth of both statements and their relationship.
Evaluation Criteria
- Both A and R are true, and R is the correct explanation of A.
- Both A and R are true, but R is not the correct explanation of A.
- A is true, but R is false.
- A is false, but R is true.
- Both A and R are false.
Tips for Answering
- Read both statements carefully before making a judgment.
- Cross-check the factual accuracy of both the assertion and the reason.
- Understand the context; sometimes, the reason may seem plausible but doesn’t directly explain the assertion.
Practice Makes Perfect
- Regular practice with assertion-reason questions can enhance critical thinking and analytical skills.
- Review previous years' question papers to familiarize yourself with the format.
By mastering assertion-reason questions, students can improve their overall performance in English and develop a deeper understanding of the subject matter.