When you fill out the CAT application form, it clearly states that whether you want to enter the Master's degree details or not. When you click on the 'Yes' tab, then it asks for your Master's degree completion status that whether you have completed you Master's degree or you are still pursuing it. There is no option to enter details of incomplete Post Graduate degree in the CAT application form. Therefore, if you are no longer pursuing the Masters in Science programme, and have left it incomplete, then you should not enter that Master's degree details in the CAT application form.