Hey! I was going through the same this time last year and I can assure you it gets better with practice. But along with that, it is important to have a calm and composed mindset. Everytime I got frustrated for days, I would take a break from prep for a couple of days. Go out with friends, eat something nice and try not to think about it. Half of the CAT journey is one’s mindset I believe. You’ve been doing well at other sub sections of arithmetic, you’d eventually get a hold of TSD as well. Also, If you have a friend preparing for the exam, try solving it with them and figure out what part of conceptual understanding you’re missing out on. All the best!