Buy the right microscope
If you want a quality microscope that will be good for your education and you want value for money, it is in your interest not to buy from a science store or a place such as a department store. Getting a quality microscope will mean going on line and looking around. Getting the wrong one will just result in it not being used, or worse still being thrown in the trash.
You microscope should be made from metal, if you find any plastic parts on it, it probably is a quality microscope. The metal parts should be the frame, any screws and the area that is used for focusing. A plastc one is basically a cheap one.
DIN is a standard recognised in German, which indicates the quality of the microscopes lense, being built to a good standard. This standard is good because it makes it easier to replace any parts like the lense and lamp and also other bits. DIN by no means that it is better than a non - DIN, but it does make getting parts easier.
These are some things that you need to bear in mind if you want a quality microscope, its just up to you to choose one that has the quality that you are after.