Step 1: Understand what a course of action must do.
A course of action is a practical step that should directly tackle the problem described, not a loosely related idea.
Step 2: Restate the problem.
The statement says Indian children are talented yet weak specifically in Science and Mathematics. So the weakness is subject-specific.
Step 3: Test Course I.
Course I blames the lack of mother-language teaching and textbooks. This is a general schooling concern and does not specifically explain weakness in Science and Mathematics, so it is not a tight remedy here.
Step 4: Test Course II.
Course II points to a lack of experiment-based teaching in these two subjects. Hands-on, experimental learning is precisely the recognised way to strengthen Science and Mathematics, so it directly addresses the stated weakness.
Step 5: Compare relevance.
Course II maps one-to-one onto the problem, while Course I is broad and indirect. Only II clearly follows.
Step 6: Conclude.
Hence only Course II is the logical course of action.
\[ \boxed{\text{Only II follows}} \]