Going for IAT for UG vs Higher studies

I'm a first dropper and an IAT aspirant whose entire year was wasted due to various problems like laziness, overthinking and some unexpected problems also came to me this year, I'm thinking that this year there are high chances that I will not be able to make into IISER, but I have got enough in JEE to get core branchs in a top State government engineering college of my state, but all I want to do is research, what should be better for me, preparing for IAT next year as a partial dropper(my parents won't allow me for full drop this year) or leaving IAT now and doing a fresh and good level preparing for 4 years and going directly for MS degree in IISER, if I didn't able to crack it also then I wouldn't have to do everything from zero level as I have all the notes and resources ready, I just need more practice, so I think it may be manageable in college, but till I need help in determining which of the option would be better

Thank you for reading till the end and replying