DS (current year 10) has brought home a letter for a school trip (4 days abroad) taking place in the Easter holidays of year 11, ie a month before exams start.
DS is keen and it sounds really interesting but the timing seems crazy to me - far too close to exams. If it makes any difference, DS is very bright and very ambitious but quite disorganised and not always good at motivating himself. He tends to leave things to the last minute and I’m worried that this trip will just add more stress when it comes to it and he’ll be panicking about revision 
School also runs revision sessions in those Easter holidays, 4 days of which he would miss. The teacher running the trip (who loves DS) thinks he would be fine but I’m unconvinced. The trip does come under the umbrella of one of his GCSE subjects but doesn’t relate to the actual syllabus or topics studied for GCSE iykwim.
Would love some objective opinions on the timing of this. Am I being an unreasonable and mean mother if I say no, or is it actually a really bad idea?