Yes, there are specific mock tests that focus on individual subjects or topics in GATE ECE. These mock tests are designed to help students assess their knowledge and understanding of specific subjects or topics in the GATE ECE syllabus. Here are some popular mock tests that focus on individual subjects or topics:

1. Made Easy:
- Made Easy is a well-known coaching institute for GATE preparation. They provide subject-wise mock tests for GATE ECE.
- These mock tests cover all the major subjects in the GATE ECE syllabus, such as Electronic Devices and Circuits, Signals and Systems, Electromagnetic Theory, Analog Circuits, Digital Circuits, Control Systems, Communications, etc.
- The mock tests are designed to simulate the actual GATE exam pattern and level of difficulty.

2. GateForum:
- GateForum is another popular coaching institute that offers mock tests for GATE ECE.
- They provide subject-wise mock tests that focus on individual topics within each subject.
- The mock tests include a mix of conceptual, numerical, and problem-solving questions to help students develop a comprehensive understanding of the subject or topic.

3. EduRev:
- EduRev is an online learning platform that offers a wide range of mock tests for GATE ECE.
- They provide subject-wise mock tests as well as topic-wise mock tests.
- The mock tests are designed by experts and cover the entire GATE ECE syllabus.
- EduRev also provides detailed solutions and explanations for each question, allowing students to analyze their performance and identify areas of improvement.

4. IES Master:
- IES Master is a reputed coaching institute that offers subject-wise mock tests for GATE ECE.
- These mock tests focus on specific subjects and cover all the important topics within each subject.
- The mock tests are designed to help students practice and improve their problem-solving skills in specific subjects or topics.

5. Gate Academy:
- Gate Academy offers subject-wise and topic-wise mock tests for GATE ECE.
- The mock tests are designed to assess students' understanding of specific subjects or topics and help them identify their strengths and weaknesses.
- Gate Academy also provides detailed solutions and explanations for each question, enabling students to learn from their mistakes and improve their performance.

Overall, these mock tests are valuable resources for GATE ECE aspirants as they allow them to focus on specific subjects or topics, assess their knowledge and understanding, and improve their performance in the GATE exam.