Considering that both parties are doing the hsc, I'd say no. In fact, you could shift it into your favor by studying with each other but depending on the people, some wil inevitably go off-topic and end up being distracted and most people are probably like that. For me, however, I'd tell the partner that its hsc, I want to do well (and hopefully she does too) and I don't want our time with each other endangering the hsc for both of us. Overall it'd be more like, "we're still together, but we're not talking as much". Like a long distance relationship? you don't see each other (lets not consider talking for the metaphor's sake), but your still together.
Of course, the actions taken will ultimately depend on the people and what they want/need.
