Is this a grammatically sound sentence?

今年、私が勉強したことがない科目を習うことにします。
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2015-02-14T04:03:38.733
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2015-02-14T12:27:00.497
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question
grammar
is this a grammatically sound sentence?
Yes, it is, if only that's what you're trying to say.

It means: _This year, I'm(we're) decided to learn (i.e. take classes of)
subject(s) that I've never studied._
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2015-02-14T06:36:30.077
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2015-02-14T06:36:30.077
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answer
It's a grammatically sound sentence. That said...

1) The mixing of 勉強 and 習う is kind of weird, I think.

2) Unless it's there for special emphasis, I think you can dispose of the 私が.

3) This might just be a question of style, but ～ことにする should be in the past
tense when making a decision (since you've already made it). If you're making
a selection, then nonpast sounds right (てんぷらにする).

今年は勉強したことがない科目を勉強することにした。

(In fact, 今年は勉強したことがない科目にした might be the least redundant. And you can also say
今年は勉強したことがない科目にする, too, since it's a selection.)

In this case, if you're going to use nonpast, then it sounds kind of redundant
to say 勉強したことがない科目を勉強することにする - just say 勉強したことがない科目を勉強する。

4) I have a slight nagging doubt about using 勉強する with 科目. Something in me
wants to say that とる or some other verb might be more natural. That's beyond
the limits of my 勘 as a nonnative speaker, though. :) Maybe a native speaker
will chime in.
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2015-02-14T12:27:00.497
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2015-02-14T12:27:00.497
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answer