re·me·di·al

/rıˈmiːdijəl/ adj

1 a : done to correct or improve something : done to make something better

Officials have pledged remedial action/measures to repair damaged bridges.

1 b : done to cure or treat someone

remedial therapy

2 : involving students who need special help to improve in a particular subject

Thirty percent of the new students need remedial classes/courses in math.

remedial education

He's taking a course in remedial reading.

(US) a remedial student [=a student who is taking a remedial class]