The problem is: in a real game, you make all the plans. In the tactics trainer, you don't know what the previous player planned, and he left you in a mess.
At least tell us how many moves.... This is madness... I'm a 1700 and my tactics rating is 1100. It rose to 1300 a few weeks ago, and then I just never got what it wanted me to do nowadays...
it seems that you are mistaking tactics with strategy. you should always have a plan/strategy, but this is not what tactics trainer is training you to do. it is training you to recognize patterns and tactics within a game or position. once you begin to recognize these patterns and positions, it is your goal to bring these positions about in your own games through your plan/strategy.
the problem is: most of us have rudimentary evaluation skills. In tactics trainer, you get presented a 'new tactic' each time, without benefit of knowing anything about it (not having played into the position).
BUT: in a game, when your opponent makes a move, and it is an error, normally you are caught NOT expecting that error to happen, and must evaluate the board using your skills.
Do you get to know how many moves a tactic takes in a game - before you play it out? no, you have to figure it out. same way with tactics trainer.
If everyone thought it was madness, no one would be working tactics daily.
regards,