Is GPA score yardstick for learning level?

Ninety-two percent pass rate in SSC is, no doubt, an outstanding achievement. With every passing year, more and more students are scoring GPA-5. Students are happy, teachers are happy, and of course, the guardians are happy. But most of all, the government is happy in this success. It is indeed an achievement of the government.
But what worries me is I have heard from my relatives, who teach at different schools in the country, that getting good grades in exams has become easier than before. In the creative format, you can't give zero to any of the answers. I also heard that teachers are under huge pressure for giving good marks no matter whether the answers are right or worth the marks.
Good GPA score doesn't necessarily mean that students have studied well or learned well. I was astonished to know from one of my friends, teaching at a school in Sylhet, how a student of 9th grade of that school defined 'power' in his Physics exam script.  He wrote: “ 'Power' means when a person forcefully take something from another person.” I don't know whether the teacher gave him marks for the answer. My point is, look at the condition of most of our students, they are keen on getting good GPA, but not interested in real learning.
A guardian
On e-mail