Introduction:
In a single year, different states or regions conduct exams or assessments to evaluate the academic performance of students. These exams have different weightage assigned to them, which determines the impact they have on the overall marks of students. Let's delve into the details of marks weightage for different states or regions conducted in a single year.

Exam-specific weightage:
1. State Board Exams: State boards conduct examinations at the end of the academic year for students studying in schools affiliated with them. The weightage for these exams varies from state to state. Some states give higher weightage to these exams, such as 90% or more, while others may allocate around 70% to 80% weightage.

2. Central Board Exams: Central boards, like the CBSE (Central Board of Secondary Education) and ICSE (Indian Certificate of Secondary Education), conduct exams at the national level. These exams typically carry high weightage, often above 80% or even 90%, depending on the state or region.

3. Entrance Exams: Some states conduct entrance exams for professional courses like engineering, medicine, law, etc. These exams have varying weightage, but they are usually significant, often contributing 50% or more to the overall marks of a student.

4. Internal Assessments: Many states or regions have internal assessments in the form of periodic tests, assignments, projects, or practical exams. The weightage assigned to these assessments may range from 10% to 40%, depending on the state's education policy.

Regional variations:
1. North India: In states like Uttar Pradesh, Bihar, and Rajasthan, state board exams generally hold higher weightage, often above 80%. Central board exams also carry significant weightage in these regions.

2. South India: States like Tamil Nadu, Karnataka, and Kerala emphasize state board exams, which usually have high weightage, often above 90%. Central board exams also hold considerable weightage in these regions.

3. West India: Maharashtra, Gujarat, and Goa prioritize state board exams, allocating high weightage to them. Central board exams also carry substantial weightage in these states.

4. East India: In states like West Bengal, Odisha, and Jharkhand, state board exams usually have high weightage, often above 80%. Central board exams also hold significant weightage in these regions.

Conclusion:
The marks weightage for different states or regions conducted in a single year varies based on the type of exam and the state's education policy. State board exams, central board exams, entrance exams, and internal assessments all contribute to a student's overall marks. The weightage assigned to these exams may range from 10% to 90%, depending on the region and the importance given to each assessment. It's essential for students to be aware of the weightage allocated to different exams in their state or region to plan and prepare accordingly.