I'm also a CA Aspirant and I personally recommend this calculator . Why? Because 1. It is allowed in CA exams 2. It is very smooth . 3. It have all the Functions for your requirement . 4. You don't have to press (X) sign twice for keeping 1st no. Constant . 5. It is reliable as compare to other calculators during exams . 6. You just give it a try .
P.S. I selected this Model after using Mj120DA and Mj120D , but satisfied with this . Some people don't know the difference between 12D and 12Da Here it is , 12Da is an advance version of 12D and in 12Da you have to press multiplication twice for continuous Multiplication , let's see this with an example.