A teacher found some of the aspects of language learning e.g. reading with understanding a text on scientific concepts. She decided to pick students who find it difficult on the particular aspects. She took separate session for them to support them read and understand such text. What is she trying to do here?

Remedial teaching refers to additional, focused instruction provided to students who are struggling with specific learning aspects. The teacher identified students having difficulty with a particular skill (reading scientific texts), separated them, and provided targeted support to remedy their specific weakness. This is the definition of remedial teaching — addressing learning gaps through additional, targeted intervention.