going by last few years' data , you must aim to secure a CRL within 800 to 850 which is almost equivalent to 99.8 percentile. NIT Warangal comes under top 5 NITs so the cutoffs are usually higher than any other NIT. For Electronics and Communications, any rank within 700 can help you to get seat in NIT Warangal as you're from Andhra Pradesh. For Mechanical Branch, last year the closing rank for EWS was 1358 which is almost equivalent to 99.7 percentile while for Civil Engineering it was around 3751 I.e. around 99.6 percentile in Jee Main. But keep in mind that these are based on last year's data and this year the cutoffs can change.
You can check the cutoffs of previous years here http://engineering.careers360.com/articles/jee-main-cutoff-for-nit-warangal#Previous-Years-JEE-Main-Cutoff-for-NIT-Warangal

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