Add exercises for utas level.

helper/constants.py

@@ -141,7 +141,6 @@ mti_topics = [
     "Poverty Alleviation",
     "Cybersecurity and Privacy",
     "Human Rights",
-    "Social Justice",
     "Food and Agriculture",
     "Cyberbullying and Online Safety",
     "Linguistic Diversity",
@@ -232,7 +231,6 @@ topics = [
     "Meditation Practices",
     "Literary Symbolism",
     "Marine Conservation",
-    "Social Justice Movements",
     "Sustainable Tourism",
     "Ancient Philosophy",
     "Cold War Era",