Should I continue doing IT?

I wish to do Computer Science at university, when I joined my Sixth Form, I was disappointed that they didn't have AS Computing (apparently they use to but they dropped it), the nearest place that did Computing didn't have so good a reputation and another was in a different town, so I chose AS IT instead, I did badly and got E in January so I resat, my coursework was better
My results were:
Mathematics: C
C1: B
C2: D
M1: B
M2: E
IT: D
Exam Resit: D
Structured Tasks: D
Physics: B
Mechanics: B
Electrons, Photons and Waves: A
Practical Skills: U
Having a D in IT, I am still eligible to move onto A2 IT however my Physics teacher says I have the option to do AS Electronics in my second year.
Should I move onto A2 IT or do AS Electronics?

I was also shocked at my Structured Tasks results, I followed the guidelines to the letter, in fact so did everybody really, the IT Teacher was really lenient on that, even writing up the MS Excel functions and formulae on the board during the spreadsheet task. Once the teacher realised that she just told us to do the Website task it ourselves and I wrote every line of the CSS file and HTML file even writing up JavaScript by my self and I still didn't get marks.

Electronics neither are mandatory for CS and tbh ICT is basically A-level Microsoft that's what a friend of mine from Cambridge said anyways.

Well even though I got bad results at IT, I at least know how well I am doing in it, I never done electronics, what do I expect to find?