What to look out for?
As I said, I determined this information using Remote Viewing techniques learnt from the NSA, who in turn robbed the idea from the Yank Army boffs. As I also said, there is a large alien ship hovering over the school, disguised using a technology much like that employed by the Predator. The aliens on this ship call themselves The Tingmakres, and their leader on this sphere calls himself Maahqu'oos Whor'ailyous, and is the mastermind of the school scheme.

No pictures are available of these creatures, and the clones are visually indistinguishable from normal people. It is in their behavior that they reveal themselves though. There are several traits that are easily noticeable, and it is these clones who will try and effect the replication process. Replication is quite slow, and requires you to be stationary for quite some time, so the first thing that you can do is, no matter what the lesson, formulate some reason to get up at least once every ten minutes. This will interrupt any attempted replication and infuriate the teacher. This can only be a good thing. However, although this functions well as general advice, it is best to try and identify which teachers are replicants. These are the observable traits.

1. The clones have a limited vocabulary: you can test this both actively and passively. Passive detection involves identifying a word the teacher uses a great deal and seeing just how often they use it. Examples include OK, um and alright. A replicant has such limited vocabulary that it will attempt to squeeze as much vocabulary value out of a word as possible. Try keeping a tally, not only will this help to ascertain whether or not the teacher is a replicant, but it will also help alleviate some of the boredom inherent in the school system.
The active method involves trying to talk to the teacher about a subject other than their own. A replicant will not have been programmed with a wide enough vocabulary to talk in depth about any other subject, so will quickly try to steer the conversation back towards their own subject. This is a sign of being a replicant.

2. The clone will try to talk to you after the lesson, in an attempt to garner more information about your personality, in order to make the replicant you more realistic. This must be avoided at all costs.

3. You may be called into the office of the replicant. If this is so, then you are being summoned for replication. If at all possible sit in a chair other than the one they intend for you to sit in. If this is not an option, sit on the extreme left of the chair, and balance there. If asked about your unusual seating style, reply with ignorance, and ask what the question means. Then, after a few minutes, move your weight to the extreme right hand side of the chair. Then back again. From what I can tell, this should interfere with the replication process enough to render that session useless.

4. Replcants have poor co-ordination for a period after their construction. Look for repetitive actions, such as pen clicking, tapping of fingers or pens, and change or key jangling. This is a sure fire method, but only works for a short period of perhaps a few days. If it continues beyond this, the replicant may be defective.