Hello student

You failed in 2nd year intermediate, in maths. You want to know that you will have to appear for maths only or all the subjects . So you don't need to go for all subjects. You will have to clear your maths paper.

If you want to apply for JEE main , cet or any other entrance exam, you have to pass your board exam first. You will have two mark sheets ie previous one and one mark sheet of maths subject when you will pass  This will affect your rank in merit list a of admission process  not your Jee rank those who have not cleared board in first attempt leg behind. So if you want to restart you can appear for all subjects of board. In that case authority will ask for a gap certificate also as there will be gap of three years in your xth board and xii board exam. So clearing board exam in first attempt is important thing. You can appear for JEE 2 or three years continuously  .

No need to worry take the decision calmly.  If your jee  score or any other exam w score will be strong enough , you will get your course of  your choice. Where is the will, there is the way.