Hi,

First and foremost,NCERT books are the best material for jee main preparationif you are in std 12 and you are going to appear for jee main the consecutive year.Otherwise you can also go for R.D.Sharma books.You can also solve previos year questions for time management and even you will get to know the pattern and also the topics on which most questions are from.But talking about online tests,many tests like mock tests,akash online jee main tests,Allen jee mains tests 2019,Avanti test series etc.These sites are very good for jee main 2019 chapter wise prepration.

Thanks..!!