The simple answer to this question is yes, it is indeed quite easy to crack TNEA. This is because I know a friend who had not studied at all and started preparing just before the exam. He did not even understand the difficult concepts and yet managed to score 197.5/200. He shared what steps he took to crack the exam
He studied exactly according to Blueprint
He learned the previously asked questions
He skipped all the difficult topics and focussed on mastering the simple ones instead
He learn the key points well as marks are allotted for key points mainly
All the one-word answers usually come from the back of the chapter so he studied them well.
Since there are no practical tests you get almost full marks in practicals at Anna University
So we can say cracking the exam is not that difficult but understanding the concepts is.