Group 2 cs executive (dec 2025)

I'm appearing for group 2 in dec . I've not done any practice of Tax law, I've learnt 80% of provisions of all the chapters , I'm just scared of questions, how to practice ?? ( I don't want to get exemption , I just want to pass ),I follow Vivek Gaba sir for tax . Do I still have time to practice enough to pass in dec ?? ( please guide me , how to practice )My theory subjects are strong and in CMSL and ECIPL I'm dont with 70% of syllabus once.