Yes, there are many free online courses and certifications available for BCA students.

1. Coursera:

It has a large number of courses in the field of computer science, data science, programming languages, and many more.

You get certificates once you have completed any course.

2. edX:

Another platform with many free courses: programming languages, data structures, algorithms, and machine learning, among others.
Diplomas are available upon course completion.
3. Udemy:

Even though it offers both free and paid content, most free ones deal with programming, data science, and other relevant content.
Sometimes, for free courses, certificates are paid.
4. Google Developers:

Provides free online courses and certifications on various Google technologies, including machine learning, cloud computing, and web development.

5. YouTube:

YouTube also provides very valuable free tutorials or lectures on a wide range of topics like programming, data science, or web development.
More Tips:
Find Relevant Courses: Try to learn from relevant courses to your BCA curriculum or career goals.
Practice Regularly: Solve problems and practice coding for reiterative learning. Make a Portfolio: Prepare projects that demonstrate your skills and knowledge.
Network with Others: Connect with other learners and professionals online in forums and communities.   Using these free online options will help you to enhance your education in BCA, furthering skills for a possible good career.

https://www.careers360.com/courses-certifications/articles/list-of-certification-courses-along-with-bca