It depends on the stage of life, the career path you choose, and the opportunities you want to pursue.
Importance in Higher Education :
College Admissions - Class 12th marks play a major role in deciding eligibility. E.g., admission into top colleges like DU or many state universities is based on 12th board percentages.
However, for competitive exams (like JEE, NEET, CLAT, CUET), 12th marks percentage plays an important role while deciding the eligibility Criteria for whether to appear for the exam or not.
Scholarships: 10th and 12th Marks often help students get merit-based scholarships.
Importance in Job Opportunities :
Campus Placements - Many companies set a minimum percentage cutoff in Class 10th and 12th (often 60% or 70%) to shortlist candidates.
Government Jobs:
Most competitive exams (UPSC, SSC, Banking, Railways) focus on exam scores rather than board marks. But still the eligibility criteria may ask for a minimum percentage in 10th or 12th.