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Below are the few things I found which can help to reduce rejection/pass EQP process.

1. Keep Your vendor name same as Vendor Name of your Marketplace account
2. Create your extension with developer mode enabled
3. Must have composer.json in root folder of extension Eg. app/code/Vendor/Module/composer.json" with correct configurations and dependencies
4. Must have registration.php in root folder of extension Eg. app/code/Vendor/Module/registration.php"
5. Do not use $_REQUEST, $_POST, $_GET, $_FILE directly
6. Never end class file with ending php tag ?>
7. Do not use die() or exit() in your code.
8. Check extension functionality with Magento compilation php bin/magento setup:di:compile
9. Remove unnecessary code and comments
10. Use spaces for indentation
11. Check compatibility with production mode enabled
12. Test with cache enabled and disabled
13. Validate your package e.g. php validate_m2_package.php my-theme.zip my-module.zip
14. Check for code duplication Refer Use ClassPreferences and/or Magento 2's plugin structure to avoid duplicating code.
15. Check coding standard with phpcs E.g. $ vendor/bin/phpcs /path/to/your/extension --standard=MEQP2 --severity=10
16. Do not use // @codingStandardsIgnoreLine or // @codingStandardsIgnoreFile in code
17. Do not use Magento logo in your documents or images
18. Do not use "Product Box Image" as extension main image
19. Add proper description for your extension functionality
20. Correct grammatical errors (punctuation, capitalization, word usage, etc). Remember to use "a","an", and "the" correctly. Make sure words are plural when necessary. Be sure words that should be past tense are past tense.
21. Do Functional/Unit Testing. as per @bhavani's answer
22. Submit an e-copy of your Tax Forms to [email protected] (Required only if you are selling paid extensions)

Keeping the practice of following above standards will surely improve extension quality.