Errorless and Modern ABC books are both designed to help students prepare for entrance exams and competitive exams. However, Errorless is more focused on practice questions while Modern ABC provides a comprehensive coverage of the syllabus.

• Errorless covers a wide range of topics and has a large number of practice questions for each topic.


• Modern ABC covers all the topics in detail and has a good mix of theory and questions.

The difficulty level of the questions in both books is subjective, depending on the individual's level of preparation. However, Errorless questions are generally considered to be more difficult than Modern ABC.

• Errorless questions are designed to challenge the student and test their understanding of the topic.


• Modern ABC questions are more straightforward and are designed to test the student's knowledge of the topic.

Both books are well-presented and have a clear language, making it easy for students to understand the concepts. However, Errorless has a more concise language and a simpler presentation, while Modern ABC is more elaborate and detailed.

• Errorless uses bullet points and diagrams to explain concepts, making it easy for students to revise and remember.


• Modern ABC has more text and examples, which can be helpful for students who need more detailed explanations.

Choosing between Errorless and Modern ABC depends on the individual's learning style and requirements.

• Errorless is recommended for students who prefer more practice questions and want to test their understanding of the topic.


• Modern ABC is recommended for students who want a more detailed explanation of the topics and need more theory to understand the concepts.

Overall, both books are good resources for students preparing for entrance and competitive exams, and using both can provide a well-rounded preparation.

Errorless is just a collection of questions asked in various medical & engineering entrance exams in last 25 years. Some of those are questions from 1990s. To be honest, of late, the pattern of questions has changed a lot. It's not similar to 1990s or early 2000s!Haven't used ABC, so can't tell. :)