they are not just studing and keep trying your best
hard.
Yes!
no 7th grade placement tests arent hard.
It could be hard and at the same time its not that hard. It depends on how motivated you are to get the license and how prepared you are in taking the tests.
yes. it's really difficult
No, not if you read the book.
they are more important, so its more work
Study hard to earn better grades on future assignments and tests.
You would only get high marks if you revised and worked as hard as you can
The tests you can do is the streak test, the luster test,the finger nail test(which is scratching it ti see if its hard or not).
Most Hard Disks these days are in sealed containers. Most people judge how fast or how slow a hard disk is by how fast it will do certain things. The technical people can talk about wetstone tests, drystone tests, slighly damp rock tests, but, if you can save a 20 page word document in 10 seconds on you old machine and 2 seconds on a new machine then what is the RPM of both
If you know what to do or have revised thoroughly, you won't do badly in any science test.