For any student, working towards getting an admission in the top 5 National Law Schools is nothing short of the most difficult thing in the world!
With 6 months in hand, I would say you are at a good place to begin CLAT preparation provided you stick to a study schedule and use good study materials. If possible attend a 40 days crash course with us, as a final brush up. Put in sincere efforts and you will certainly be better off, than now. All the best!