Another site:
AllTop 200 most popular tests to learn English...
1) Test de niveau anglais (webmaster) 6 780 568
2) Placement test : grammar for beginners (anonyme) 5 995 711
3) A/AN (webmaster) 5 367 691
4) Auxiliary BE (webmaster) 3 225 484
5) Present continuous (webmaster) 3 000 654
6) Present simple (webmaster) 2 918 420
7) Present simple (webmaster) 2 598 844
8) Present continuous (webmaster) 2 436 860
9) Adjectives (webmaster) 2 094 364
10) A/an (anonyme) 2 016 693
11) Present perfect simple (webmaster) 1 645 806
12) Preterite (webmaster) 1 631 259
13) Vocabulary - Placement test (bridg) 1 619 869
14) Preterite (webmaster) 1 449 543
15) Short placement test (webmaster) 1 444 183
16) To be (bridg) 1 407 025
17) What time is it? (webmaster) 1 350 163
18) Present perfect (webmaster) 1 348 106
19) The alphabet in English (webmaster) 1 321 833
20) Adjectives (anonyme) 1 216 650
21) What time is it? (webmaster) 1 209 656
22) Numbers (webmaster) 1 189 026
23) 'A' ou 'An' (anonyme) 1 176 547
24) Two presents: present continuous, present simple (webmaster) 1 150 264
25) To be (bridg) 1 146 169
26) Comparatives / Superlatives (webmaster) 1 106 148
27) Numbers (webmaster) 1 071 415
28) CAN / MUST (webmaster) 1 059 201
29) THE/ A / AN / nothing (webmaster) 1 034 801
30) Comparatives (webmaster) 1 007 745
31) Family life (bridg) 1 001 430
32) Numbers > 100 (webmaster) 986 973
33) Future (going to/will/present continuous) (anonyme) 964 947
34) Plural (webmaster) 956 299
35) Superlatives (webmaster) 875 792
36) Adjectives (anonyme) 875 307
37) Simple present (bridg) 854 524
38) Spelled words N°1 (bridg) 850 702
39) Placement test beginners: Check your spelling (anonyme) 830 341
40) Introducing oneself (webmaster) 827 542
41) Adverbs of frequency (anonyme) 818 241
42) Family (bridg) 785 259
43) General test-End of high school / Beginning of university (webmaster) 783 338
44) Present simple (anonyme) 781 915
45) Frequency adverbs (webmaster) 778 188
46) Present BE + Ving (bridg) 765 717
47) Passive form (anonyme) 725 220
48) Genitive (webmaster) 724 105
49) Family tree (anonyme) 719 822
50) Preterite: simple or continuous? (webmaster) 717 411
51) Placement test (beginners) (lili73) 701 690
52) Past simple or present perfect (anonyme) 695 288
53) Future (webmaster) 676 322
54) 2 Preterites (webmaster) 662 731
55) Present perfect simple (bridg) 662 515
56) Preterite (webmaster) 621 418
57) List of 200 irregular verbs and audio (bridg) 616 644
58) Modals (webmaster) 613 116
59) Spelled words N°2 (bridg) 609 602
60) Height (webmaster) 606 662
61) Modals (webmaster) 606 480
62) Articles a / an / the (anonyme) 596 768
63) Plural forms (bridg) 577 903
64) Nationalities (webmaster) 574 616
65) Past continuous / Past simple (anonyme) 567 505
66) Irregular plurals (bridg) 554 043
67) Two presents: simple and continuous (webmaster) 550 036
68) Preterite (bridg) 549 450
69) Superlatives (frapedur) 539 948
70) Vocabulary: greeting people (here4u) 536 517
71) Give your opinion (bridg) 532 384
72) Adverbs of Frequency (bridg) 517 290
73) Present simple or continuous (anonyme) 512 140
74) Present perfect / preterite ? (anonyme) 510 574
75) Possessive case (anonyme) 481 008
76) Countries & nationalities (bridg) 473 857
77) 'The' or nothing? (webmaster) 471 489
78) Past tenses (bridg) 471 382
79) Introducing oneself (easy) (webmaster) 470 958
80) Passive voice (webmaster) 464 025
81) Present Simple vs. Past Simple (anonyme) 458 658
82) Questions : how to ask them (anonyme) 448 742
83) General Test II / End of high school / Beginning of universi (webmaster) 446 411
84) IN, ON, AT or TO? (webmaster) 445 724
85) Relative pronouns (webmaster) 445 016
86) Comparative of superiority (anonyme) 439 304
87) How to pronounce the final -ED? (past simple) (webmaster) 438 497
88) Relative clauses (webmaster) 423 721
89) Sounds: [h] (webmaster) 419 709
90) Comparative (anonyme) 414 302
91) A/an/Ø (bridg) 399 194
92) Past simple (anonyme) 398 392
93) Future simple (anonyme) 396 796
94) This / That / These / Those (webmaster) 392 804
95) Conditional (webmaster) 392 003
96) Passive voice (anonyme) 391 081
97) Comparing (webmaster) 388 262
98) Can / could/ may/ might (woodyrun) 380 006
99) Present perfect or past tense (anonyme) 378 088
100) Much, many, little and few (felin) 373 354
101) Personal pronouns (anonyme) 371 427
102) Preterite continuous (BE + -ING) (webmaster) 369 894
103) Genitive case (bridg) 368 462
104) Some, any, no, enough, too/too much/too many (webmaster) 368 432
105) Confusing words - Placement test (bridg) 364 726
106) Irregular verbs (webmaster) 363 919
107) Numbers from 1 to 10 (anonyme) 361 729
108) Past perfect simple, past perfect continuous (anonyme) 361 020
109) Present continuous or present simple (webmaster) 359 815
110) Present perfect or preterite? (anonyme) 357 425
111) Simple Past : regular verbs (anonyme) 353 611
112) Comparative Adjectives (bridg) 352 447
113) Who, Whom, Which, or Whose? (anonyme) 349 143
114) Past simple (video) (anonyme) 348 825
115) Past simple or past continuous (anonyme) 343 566
116) While / When (anonyme) 339 527
117) What time is it? (webmaster) 338 212
118) Modals (tinou) 336 785
119) Modal: may/might (anonyme) 334 393
120) Cardinal and ordinal numbers (anonyme) 328 920
121) The superlative (anonyme) 326 308
122) Possessive adjectives and pronouns (woodyrun) 324 578
123) How to talk about the weather (lili73) 320 922
124) Since and for (anonyme) 319 166
125) Flags (webmaster) 317 777
126) Irregular verbs (bridg) 316 271
127) Prepositions - in, on, at (anonyme) 314 247
128) Pronouns (woodyrun) 314 241
129) Tenses (anonyme) 312 392
130) Placement test 3 (webmaster) 310 734
131) Order of adjectives (webmaster) 306 749
132) Could/Couldn't (laure95) 306 092
133) Comparative (anonyme) 304 915
134) Agreement Tags (webmaster) 304 240
135) Adjectives and prepositions (anonyme) 304 191
136) Asking questions (webmaster) 303 379
137) Present perfect OR simple past? (bridg) 298 588
138) Questions in the past tense (anonyme) 297 773
139) Superlative Adjectives (bridg) 296 019
140) Uncountable nouns (webmaster) 296 000
141) Object pronouns (bridg) 295 322
142) Placement test 1 (anonyme) 292 988
143) Passive form (anonyme) 291 909
144) Present simple (anonyme) 291 553
145) Can/Must/Should (laure95) 290 092
146) Prefer/rather (bridg) 289 677
147) Past perfect (lili73) 288 847
148) Must or Have to? (woodyrun) 287 845
149) The/an/nothing (bridg) 285 440
150) To be (anonyme) 283 560
151) Can and can't (laure95) 281 976
152) Vocabulary: asking and answering (here4u) 280 469
153) Modal verbs (bridg) 277 421
154) Some / Any / no... (bridg) 273 979
155) Days of the week (bridg) 269 132
156) So / neither (anonyme) 264 446
157) Past simple (video) (anonyme) 263 867
158) Present continuous (chnawa) 260 781
159) Used to (bridg) 260 461
160) Should / must (anonyme) 259 896
161) Past tense (anonyme) 259 489
162) Vocabulary: on the phone (here4u) 258 783
163) Find out a quantity (webmaster) 258 646
164) Superlative + and adjective (anonyme) 257 440
165) Articles : a / an / the / Ø (anonyme) 257 383
166) Comparative and superlative (anonyme) 255 874
167) Numbers 1/100 (anonyme) 253 768
168) Modal can (video) (anonyme) 253 135
169) Comparatives (anonyme) 249 092
170) Relatives pronouns (who, which, that...) (anonyme) 247 855
171) A few, a little, few, little (anonyme) 245 759
172) Vocabulary: at the restaurant (here4u) 245 682
173) Would rather / would prefer to (anonyme) 244 529
174) Present continuous and the Going to form (anonyme) 242 881
175) Should/ have to/ must (anonyme) 240 328
176) Have something done (anonyme) 239 934
177) The past (webmaster) 237 917
178) Used to/would (woodyrun) 237 795
179) Future continuous and future perfect. (felin) 237 744
180) How to ask a question in English (bridg) 235 658
181) I wish, if only (felin) 234 179
182) Pluperfect (webmaster) 234 144
183) Countable or Uncountable? (webmaster) 233 326
184) Some / any (younes91) 233 129
185) Should / shouldn't (anonyme) 231 669
186) Present simple or continuous (bridg) 230 805
187) Adjectives - ing and ed (felin) 229 244
188) Hypothesis (webmaster) 228 360
189) Auxiliary BE (anonyme) 226 516
190) Articles a/an/the/0 (bridg) 226 376
191) Article The or nothing (anonyme) 226 102
192) Must or mustn't (laure95) 226 006
193) Present perfect with Ever - never - (anonyme) 225 717
194) Present continuous OR Present simple? (bridg) 225 585
195) Simple Preterite OR Preterite (BE+ing) (webmaster) 222 926
196) To / in order to / so as to / so that (irish21) 220 631
197) Comparison (komiks) 219 630
198) Present perfect (bridg) 219 609
199) What time is it ? (anonyme) 217 732
200) Indirect speech (bridg) 216 940
