My gate score is 529 in gate 2019, cse branch and general category.Is there any chance of iits or nits for m.tech?

Hello Pankaj, first of all congratulations for your GATE score. Now, we can assess your chances of getting in IITs or NITs on the basis of previous year cut-offs. Firstly I would like to mention the closing GATE score of IITs for previous years available for General category (for CSE branch).
1) IIT Madras- 770 (in 2018)
2) IIT Bombay- 750 (in 2018)
3) IIT Kharagpur- 791 (in 2017)
4) IIT Guwahati- 770 (in 2017)
5) IIT Kanpur- 732 ( in 2016)
6) IIT Roorkee- 53.64 marks
7) IIT Hyderabad- 731 (in 2017)
8) IIT Gandhinagar- 600 (in 2017)
9) IISc Bangalore- 894 (in 2018)
10) IIT Dhanbad- 571 (in 2017)

Now, I would state the previous year's closing cut offs of CSE branch of NITs. (In 2018)
1) Central University of Rajasthan- 463
2) NIT Jalandhar- 544
3) IIEST Shibpur- 588
4) MNIT Jaipur- 628
5) NIT Bhopal- 625, 607 and 618 depending upon the M.Tech course you choose.
6) MNNIT, Allahabad- 707
7) NIT Goa- 552
8) NIT Surathkal- 711
9) NIT Manipur- 458
10) NIT Meghalaya- 453
11) NIT Nagaland- 449
12) NIT Puducherry- 513
13) NIT Sikkim- 481
14) NIT Agartala- 485
15) NIT Arunachal Pradesh- 453
16) NIT Calicut- 680
17) NIT Delhi- 615
18) NIT Durgapur- 525
19) NIT Hamirpur- 552
20) NIT Jamshedpur- 568
21) NIT Kurukshetra- 592
22) NIT Patna- 520
23) NIT Rourkela- 656
24) NIT Silchar- 505
25) NIT Trichy- 747
26) NIT Warangal- 759
27) IIITDM Jabalpur- 493
28) SVNIT Surat- 620
29) SLIET Longowal- 453
30) VNIT Nagpur- 632
Therefore on the basis of previous year's result you have chances to get NITs.

To get a more accurate prediction, use this college predictor link:
https://engineering.careers360.com/gate-college-predictor

Also to know more about the previous year cut off patterns, visit:

https://engineering.careers360.com/articles/gate-cutoff

All the best!
I hope this helps.