what all the basics should we have to learn before studying all organic chapters? PLS HELP I am weak in chemistry and specially in all organic chapters!!!

Dear Student, before starting organic chemistry of class 12th, just go through the nomenclature and hydrocarbon chapter of 11th standard, clear you basic first and then start with you haloalkane chapter. Try to understand whole chapter, practice examples and exercise questions of NCERT. Try to solve as many questions as you can, you can take help of the questions provided on our site. Study regularly and keep Saturday and Sunday for the revision.
When ever you encounter any name reaction try to learn it with the help of mechanism. Practice mechanism of all reaction, this will increase your problem solving skills and will make organic chemistry easier for you.