13 May 2008
it is upto you to decide whether you need coaching or not, pls don't ask such questions from anybody, always believe in yourself.
if you opt for self study: for dt : read from VK Gupta's notes (will be sufficient) for idt : read from Ajay Jain's notes (in addition, also can read previous years solution book by same author)
20 May 2008
Please clarify whether you are a commerce student or science student. In my view attending class may help as it will simplify the process of understanding the subject first. Then you can master it by getting into the depth of the subject. At the end of the day all students are interested in passing out in first attempt. So do not leave anything to chance. I recommend attending classes for both these subjects.