Hello,

You can take help of this knockout package and score around 99 percentile - https://learn.careers360.com/knockoutfull-jee-main-april/?icn=jee-main-knockout-lpage&ici=navigation-header_jee

It offers unlimited mock test which will increase your accuracy along with speed. Also you can practise past 17 year JEE Questions

Apart from that to boost your score the only thing you can do is solve sample papers and previous year papers.It will help you get familiar with paper pattern and difficulty. Also pay attention and focus on your weaker sections. Take help of reference books like SL Loney, Hall and Knight etc for Trigonometry, Co-Ordinate geometry and Algebra section.Don't start anything new but work on weaker areas.

Hope this was helpful