In general, aptitude test consists of more features and it is designed and used for the career and employment arrangement.
In the Coding Test, the candidates have to answer for various programming languages. Furthermore, you need to concentrate more on the concepts as per the schedule. Also, the TCS is giving the questions from previous years.
Therefore you have to download it and prepare well. This is the toughest round to clear. After that spend more time on the questions and concentrate on it. Also, many of the aspirants are unable to find the accurate questions.