form 4 ok la... sure got hard part for every level or stage...

at age 16= form 4 hard

at age 17= form 5 harder than form4

at age 18-19= form 6 harder than form 5...

so you see... things get tougher but that's what we need to endure to develop.. you don't want your brain to stop growing at form 4, do you?