Here are some useful courses a 12th grader can do before starting an Engineering program :

1. Programming Basics – Learn C, C++, Python or Java. This builds problem-solving skills.

2. Mathematics Refresher – Brush up on calculus, algebra, and trigonometry.

3. Computer-Aided Design (CAD) – Courses like AutoCAD or SolidWorks help in design skills.

4. Robotics or Electronics Basics – Simple Arduino or basic circuit design courses can be helpful.

5. Communication Skills – English speaking or writing courses improve presentation and teamwork.

6. Soft Skills – Time management, leadership, or teamwork workshops.

7. Online Certifications – Short courses on platforms like NPTEL or Coursera related to your branch (e.g., basic mechanical, civil, or computer engineering).

These will give you a stronger base and make your profile stand out.

Hope it helps !