| | Established | 1960 |
| | Level | Higher Secondary |
| | Type | Co-Educational |
| | Board | State Board |
| | Medium of instruction | Tamil |
| | No. of students | 498 |
| | No. of Teachers | 43 |
Ghss(Boys)-Thellar is located in Thellar, Tiruvannamalai. 23 dedicated and professional teachers ensure that the children get the maximum out of their eduaction in this State Board school.
1960 saw Ghss(Boys)-Thellar being launched. This school's primary medium of instruction is Tamil and the student teacher ratio is 21:1. The school takes pride of its excellent teaching methodology.
Classes from 6 to 12 run in this school. This school has approximately 498 as student strength. It has a library as well with over 5600 books.
The school has given exceptional results in the academic sphere and its students have excelled in extra co-curricular activities too. The perentage of students passing the exam is 100% with 56% scoring first grade.
| School Code | 33060608602 |
| Status of Building | Government |
| Total Classrooms | 3 |
| Student Teacher Distrubution | Teachers 43 | Student 498 | |
| Boys to Girls Ratio | Boys 344 | Girls 154 | |
| Students Distribution | Primary 0 | Secondary 195 | Hr.Secondary 303 |
