Every year toughness of JEE Advanced varies so it is almost impossible to predict which score is safe but , let me give you a very rough idea marks around 230 for general category candidates will have good chance for CSE department in IITs.

RAnk under 650 for general candidates is sure shot for top IITs and for all other IITs cse departments rank ,under 4K is a safe rank.

Unfortunately, securing a CSE seat in an IIT with 146 marks in JEE Advanced is highly unlikely.

The competition for CSE seats in IITs is extremely intense. To secure a seat in a top-tier IIT for CSE, you would typically need to score well above 200 marks. While the exact cutoff varies each year based on factors like difficulty level of the paper and number of applicants, securing a CSE seat with a score of 146 is improbable.

However, don't be disheartened. You can still explore other engineering options in prestigious institutes. Consider your other preferences and explore colleges offering different branches.

Remember, JEE Advanced is just one step, and there are many other paths to a successful career in engineering.

hope this helps you!!