My younger brother(1 year younger) is facing a very similar situation as you all are. He too attempted 65 and got around 22 incorrect. As mentioned many times the incorrect ones are the ones you thought are right and later on you realise you did a blunder or you guessed an answer after eliminating 2 options(which is not recommended but I know the temptation). The question is obviously how to improve accuracy and which books to solve and all. There is obviously no one answer.
I personally feel that most of the time we try too hard... thinking solving this material is best... I need to solve more packages... and all that , but in the end.. the foundation is the key. Sometimes for some chapters, you dont need to jump into Level 100 questions, but first cover the theory and concepts. It might sound tedious.. but I would recommend looking at your question papers once again, look at the ones you did wrong, and the ones you left, I bet half of them were not like Level 100 questions, instead many of them would be like... I wish I read that more of that.. yeh toh ncert se daal diya thaa.. or yeh toh mere coaching material ka easy questions ke section mein thaa!!.
I would recommend that just make your basics stronger. If you have joined coaching, then complete till the Level Three ( My brother is in Narayana and it contains questions till Level 6), you can do every question if you want but I have noticed that those are for the ones who want to nail the exam and do even the hard questions that are very few in the actual paper.
One more important thing I would recommend is to cover every topic(at least basics), the reason being that sometimes many simple questions come from topics that you thought were unimportant or had very less weightage.
I know many people recommend focussing on your strong topics... and I think thats more important in Advance than Main. In Main, first cover your bases of all topics and then focus on the topics you enjoy or are strong. If you work hard.. you can do both.
There is no magic button. There is no magic formula or shortcuts. You may think you were unlucky, but remember you will not always be unlucky. And if you think you think you are always unlucky or make excuses.. then you didnt actually work hard and you just pretend you did.
These 2 months are priceless, learn from your mistakes. The one who learns most will end up happy. The advantage and disadvantage of having Jee 2 times.
This is my personal experience. Some key tips that I think could help:
- Chemistry NCERT
- Just solve in Maths
- Complete previous years(it helps a lot)
- Be around students, take help..
- Attempt many mocks. Many means attempt like 1 mock test every day before your exam(10 days). And give a regular mock test every week. Try to give mocks of various institutes as well.