General Category:
- The general category refers to candidates who do not fall under any reserved category such as OBC, SC, ST, or EWS.
- In most competitive exams, including the UGC NET, the general category candidates have the highest cutoff marks and are required to score the highest to qualify for the exam.
- The weightage of marks for general category candidates is usually the same as the overall weightage for the exam.

OBC Category:
- The OBC (Other Backward Classes) category includes candidates who belong to non-creamy layer OBCs.
- OBC candidates are given a certain percentage of relaxation in the qualifying marks as compared to the general category candidates.
- The weightage of marks for OBC candidates may vary from exam to exam, but it is usually lower than the weightage for general category candidates.

SC Category:
- The SC (Scheduled Caste) category consists of candidates who belong to the scheduled castes as recognized by the Indian government.
- SC candidates are provided a significant percentage of relaxation in the qualifying marks as compared to the general category candidates.
- The weightage of marks for SC candidates may vary from exam to exam, but it is generally lower than the weightage for general category candidates and higher than the weightage for OBC candidates.

ST Category:
- The ST (Scheduled Tribe) category comprises candidates who belong to the scheduled tribes as recognized by the Indian government.
- ST candidates are given a considerable percentage of relaxation in the qualifying marks as compared to the general category candidates.
- The weightage of marks for ST candidates may vary from exam to exam, but it is usually lower than the weightage for general category candidates and higher than the weightage for OBC candidates.

EWS Category:
- The EWS (Economically Weaker Section) category was introduced recently to provide reservation for candidates who belong to economically weaker sections of the society.
- EWS candidates are given a certain percentage of relaxation in the qualifying marks as compared to the general category candidates.
- The weightage of marks for EWS candidates may vary from exam to exam, but it is generally lower than the weightage for general category candidates and higher than the weightage for OBC candidates.

Overall, the weightage of marks for different categories in competitive exams is determined by the conducting authority and may vary from exam to exam. It is important for candidates to refer to the official notification or information brochure of the exam to know the specific weightage of marks for each category.