Jack I think your passage may be much better written in this way: I do not agree with the idea that pre-set numerical targets for gender parity should be applied to university admissions. I understand that this idea has been proposed by some as a measure to counter gender discrimination and to achieve gender parity. "Bring up" or "brought up" is not correctly used in your original. If I may say so, the whole passage does not "read English" at all. You also need to learn the topical vocabulary for this subject before you can write about it well.

I do* not agree with the idea that *an*equal number of males and females should be* accepted in every subject.I guess this idea may be brought up in tune with the trend of fighting* against sexual discrimination. Yes you have used bring up correctly. To bring up is to introduce a topic or idea into a conversation. In this case the conversation is 'fighting sexual discrimination' as a whole. Remember, a conversation can be between two people or it can be a global discussion of one topic. "she and I had a conversation yesterday" or "I have my opinions about politics but that's a conversation I do not want to be a part of"