I wanted to take one more year to prepare and write jee mains. will I face any problems in future on doing like this?

No, you may take another year for preparation, only if this was your first try at JEE, and you want another, keeping in mind your aspirations and related concerns. There will hardly be any problem in future, as long as you secure a Good Engineering College the following Year. With the rising stressful Schedule and School Life, its understood that many aspirant long to take a break of a Year, prepare strongly and crack JEE.

For more information about JEE Main Preparation do follow the link below

https://engineering.careers360.com/articles/jee-main-preparation-tips

I would personally suggest you few Material which you must follow in your Drop Year

1. Resonance Rank Booster+ DPP Package

2. Allen Leader Test Series (Online/Offline)

3. Arihant Handbooks Physics/Chemistry

4. Allen Mathematics Handbook (PDF Available)

5. Study Chemistry more Seriously, by Making Notes and Solving Testbooks, Question Papers, Previous Papers, etc. Even a 1.5x extra effort in Chemistry, yields your 3x better results. Going by Current trends, Chemistry Section is more or less moderate in most JEE Main/Advanced Papers.

Lastly follow a proper test taking strategy, a strategic routine for regular preparation and strategically select your preparation material. From My Experience after Cracking JEE M&A couple of years back, its 50% strategy and 50% hardwork.