K TET NATURAL SCIENCE || ENVIRONMENT ISSUES ||

[@snl3169]

BOD de full form Biochemical oxygen demand ennu anu

[@naseerank7087]

Good class....

[@srineeshaps9862]

Thanks mam

[@sajinapk8792]

Thank u mam...

[@princysajeev3806]

Nice class mam..... Very effective and powerful class.

[@jisjesjos7637]

👍

[@jayaprakash-cq1uk]

K tet nu apply cheyyenda time kazhinjo.ktet next exam ennanu please reply madam