Don't question.
I'll go to police station and make report.

You go to most EXPERT* websites about pencil leads and read about their say.

All will tell you HB is the de facto standard around the world.

Only Malaysia lain daripada lain.

http://www.jetpens.com/blog/picking-the-pe...ss-grade/pt/475

http://www.thealmightyguru.com/Pointless/PencilGrades.html

"HB occupies the very middle of the scale, and is included as the default lead in most mechanical pencils because of its suitability for writing."

"The No. 2 / HB grade pencil is the middle grade and is the most commonly used pencil for generic use. Harder grades are used for drafting and engineering, while softer grades are used usually by artists."

Then again, why those developed nation teachers never complain like our teachers do? Are they less capable or Malaysian teachers love to pick on the most minor things to punish students for their own shortcomings?