I will try and explain to you why it is unfair. Bare in mind, I also love Barts, but I am not going to try and defend an unfair admissions system (even though the medical school is great
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Firsly, the 'great' UCAS tariff system. Well, firstly, the ucas tariff itself is stupidly selective and unfair. By proxy, to base an admissions system, on an unfair points system clearly makes the system arbitrary.
For example, person X may have excelled in sport to a national/regional standard and achieved his gold duke of edinburgh or excelled in a hobby like debating (winning an competition Oxford Union for example). How many points does person X get for all this??? A total of 0 points.
On the other hand, person Y may have completed some simple sports leadership award that takes 2 months and gained more points than person X. Why should the system actively give an advantage to those who do music compared to sport or one qualification ahead of another? It takes longer to achieve a national standard in sport than it does to gain your grade 6 in music.
In addittion, it centres the grade predictions in selecting for interviews. As you may know some schools do not predict A*'s or some may be especially generous in predicting them. This disparity only makes it unfair for some students.
I myself managed to get an interview so I am not speaking from experience. However, you cannot deny that some aspects of this system is in need of reform.
In my opinion, a system that looks at EVERYTHING to decide who is interviewed is far better. For instance at UCL, they look at your GCSE's, AS grades, Personal Statement, Reference etc so that you cannot be discarded on one weakness in your application. Everyone who is then interviewed has a reserved place- they just have to prove to the interviewers that they deserve it. Barts on the other hand bases interviews pretty much on a tariff system that in itself ignores a great variety of activities.
I love Barts and it is a great university- a privelege for anyone to go to- but come on dude- the tariff system is grossly unfair.