Do you mean that you do upper twice a week, and lower twice a week? That is, lifting for 4 days? Do you take a day off in between?
It appears that he/she has you on a fairly basic machine workout, hitting each body part. Use this time to focus on your muscles and how they work, so that you can isolate the feeling in your mind. Machines are used for beginners for safety reasons, until they get used to the movements, before they start with free weights.
You may be feeling exhausted because you are not yet used to the routine. Or you may be trying to lift too heavy for the 12 rep range. For variety, do the three sets in a straight order at times, and at other times, do one set of each before going back to start again. Remember, to allow for recovery days.
Personally, I feel the machines are too restrictive, and there are many isolation exercises in the workout (only two that I would consider compound). I prefer free weights and compound exercises. A compound exercise is one like the squat, the lunge, the bench press that work a number of different muscle groups at the same time.
Workout routines are not meant to be used forever. Some people change the exercises every time, others change every 4-8 weeks. There are different rep ranges (and the associated weights) that work on strength, mass and endurance. The workout can consist of 100% compound exercises, or 80% compound and 20% isolation, or any variation in between; but should always focus on compound.
At this point, I would advise you to keep at it for another month or two. Learn all you can about your body through this process. Do some research on your own. Talk to your trainer about varying your routine. Also watch your diet; as a beginner, you are adding activity you haven't done before. Make sure you are getting good nutrition, not necessarily high calories. Make sure you have enough recovery time; you don't say whether you do cardio also or not.
Hope this helps...
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