THIRUVANANTHAPURAM: Education Minister C Raveendranath has warned that both teachers and students should be vigilant to prevent the spread of COVID-19 when students in SSLC and Plus Two classes return to schools from January 1. Students should wear masks. They should not speak by lowering the mask. They must clean their hands frequently using sanitiser and soap. They must not hand over pens, pencils or drinking water. The minister gave the message through YouTube. Continuous evaluation should be done very carefully. What children have learned through online classes and what they are learning directly in the classroom should be evaluated in a small way. The main parts of it should be revised.