basically 2 tier of PE, tier 1 (polygon stamp) cannot endorse design drawings, tier 2 (round stamp), PEPC can endorse design drawings etc. The assessment for this 2 tier is different as i was told.

Tier 1 (PE)
Under Section 7(1)(a), Registration of Engineers Act 1967 (Revised 2015), a registered Professional
Engineer is allowed to take up employment which requires him to carry out or perform professional
engineering services and use the stamp as approved by the Board of Engineers Malaysia
Tier 2 (PEPC)
Under Section 7(1A), Registration of Engineers Act 1967 (Revised 2015), a registered Professional
Engineer with Practising Certificate is allowed to practise, carry on business or take up employment
which requires him to carry out or perform professional engineering services for designated engineering
works subject to section 8 of the Act.

Because PCE test you on what you should know. Not just about what you know. So it covers a wide range of questions.

2016 the first batch was the 6% that you saw. Got certificate presentation so they know how many and who. 2017 batch got their results, heard from the people taking the exam, the passing rate is much higher.